Rivera-Carrasquillo v. Calderon-Lozano , 812 F.3d 213 ( 2016 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 14-1047
    ÁNGELA RIVERA-CARRASQUILLO; JOSÉ HERNÁNDEZ-QUIÑONES; CONJUGAL
    PARTNERSHIP HERNÁNDEZ-RIVERA,
    Plaintiffs, Appellees,
    v.
    CENTRO ECUESTRE MADRIGAL, INC., d/b/a Hacienda Madrigal;
    INTEGRAND ASSURANCE COMPANY; PASIÓN ECUESTRE, INC.; GERARDO
    CALDERÓN-LOZANO,
    Defendants, Appellants,
    FLORENCIO BERRÍOS-CASTRODAD; IRMA SARA CASILLAS; AGRO
    MONTELLANO, INC., CRIADERO LA GLORIA, INC.; EDGARDO VÉLEZ;
    RESTAURANTE EL ESTRIBO; CONJUGAL PARTNERSHIP BERRÍOS-CASILLAS,
    Defendants.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF PUERTO RICO
    [Hon. José Antonio Fusté, U.S. District Judge]
    Before
    Torruella, Lynch, and Thompson,
    Circuit Judges.
    Eduardo Cobian-Roig,    with whom José R. Dávila-Acevedo and
    Cobian & Bonilla, P.S.C.,   were on brief, for appellants.
    José L. Ubarri, with   whom David W. Román and Ubarri & Román
    Law Office were on brief,   for appellees.
    January 25, 2016
    THOMPSON,    Circuit   Judge.      Spending   time   astride   an
    animal as magnificent, spirited, and powerful as a horse can be
    risky       business.      Unfortunately,       Ángela   Rivera-Carrasquillo
    experienced this first-hand when she was thrown from a horse in
    the midst of a guided ride she and her husband, José Hernández-
    Quiñones, were taking at a ranch outside San Juan, Puerto Rico.
    Rivera suffered some pretty significant injuries in her
    fall, so she and her husband1 filed suit, and they ultimately
    secured a jury verdict in their favor at the Puerto Rico federal
    district court.         In this Court, the appealing defendants say the
    district court erred in refusing either to grant them judgment as
    a matter of law or, failing that, to submit the question of whether
    the plaintiffs' suit is time-barred to the jury.             They also argue
    that certain parties may not be held liable for the negligence of
    the company who rented the horse to Rivera and put on the tour.
    After careful review of the at-times-confusing trial
    record and counsels' appellate arguments, we are unable to discern
    the district court's reasons for its rulings.               Because "we deem
    this a case where we feel we need the reasoning of the district
    court," Anderson v. Boston Sch. Comm., 
    105 F.3d 762
    , 764 (1st Cir.
    1997), we remand for the district court to explain its decision
    1
    Since we are focused on what happened at trial, we'll simply
    call them the "plaintiffs." Similarly, we'll refer to any party
    that was a defendant in the district court as a defendant here.
    - 3 -
    with respect to the statute of limitations defense and articulate
    the ground(s) on which two of the defendants are liable for
    Rivera's injuries.   And given our inability to parse what happened
    below from the limited record submitted on appeal (which keeps us
    from figuring out exactly what we should be reviewing and what
    standard of review we should apply), we necessarily explain in
    considerable detail just why we think remand is necessary.
    STATUTE OF LIMITATIONS OVERVIEW
    We readily acknowledge that, ordinarily, it makes the
    most sense to begin our discussion by describing what happened and
    how this case got here.   But this particular appeal hinges, to a
    large degree, on when Puerto Rico's statute of limitations began
    ticking   on   the   plaintiffs'   claims.     And   the   parties,
    unsurprisingly, have different views about this.     None of their
    arguments will make sense -- and the reader won't know what's
    important in our discussion of the facts underlying this case --
    unless we start with a general overview of Puerto Rico's statute
    of limitations.
    Puerto Rico's statute of limitations2 for tort actions
    like this one is one year.   
    P.R. Laws Ann. tit. 31, § 5298
    (a)(2).
    2 Because this is a diversity case, Puerto Rico's substantive
    law controls. See Alejandro-Ortiz v. P.R. Elec. Power Auth., 
    756 F.3d 23
    , 26-27 (1st Cir. 2014) (recognizing that Puerto Rico's
    statute of limitations "is a substantive and not a procedural
    matter," and so we must apply it in diversity cases).
    - 4 -
    A claim filed after time runs out is barred, regardless of its
    merit.   Much of the controversy here revolves around exactly when
    that one-year period began.
    The one-year clock begins ticking "from the time the
    aggrieved person had knowledge" of the existence of her claim.
    Id.; see also Rodríguez-Surís v. Montesinos, 
    123 F.3d 10
    , 13 (1st
    Cir. 1997).   To have "knowledge" that she has a claim -- thereby
    triggering the countdown -- a person needs to be aware not only
    that she has been injured, she also needs to know who is (or may
    be) responsible for that injury.    See Rodríguez-Surís, 
    123 F.3d at 13-14
     (recognizing that a plaintiff must have an "awareness of the
    existence of an injury" and knowledge of the injury's "author"
    before the statute of limitations begins to run).
    Puerto Rico's Supreme Court recognizes two types of
    "knowledge" as sufficient to start the clock.      First, a plaintiff
    may have "actual knowledge of both the injury and of the identity
    of the person who caused it."      Alejandro-Ortiz, 756 F.3d at 27;
    see also Rodríguez-Surís, 
    123 F.3d at 13-14
    .    The one-year period
    begins to run on the date a plaintiff gains this knowledge.       See
    Alejandro-Ortiz, 756 F.3d at 27.
    Alternatively, a plaintiff "is deemed to be on notice of
    her cause of action if she is aware of certain facts that, with
    the exercise of due diligence, should lead her to acquire actual
    knowledge of her cause of action."    Id. at 27.   The test for this
    - 5 -
    so-called "deemed knowledge" is an objective one.             Id.    Under
    Puerto Rico law, deemed knowledge "is essentially parlance for the
    discovery rule, which stands for the proposition that '[t]he one-
    year [statute of limitations] does not begin to run until the
    plaintiff    possesses,   or   with    due    diligence   would   possess,
    information sufficient to permit suit.'"            Id. (alterations in
    original) (quoting Villarini-García v. Hosp. Del Maestro, Inc., 
    8 F.3d 81
    , 84 (1st Cir. 1993)).         In other words, the statute of
    limitations begins running at the time a reasonably diligent person
    would discover sufficient facts to allow her to realize that she'd
    been injured and to identify the party responsible for that injury.
    The rationale being, of course, that once a plaintiff comes into
    such knowledge, she can file suit against the tortfeasor.3
    Determining the date on which a diligent plaintiff would
    have learned enough to allow her to file suit presents a question
    of fact that may be submitted to the jury in an appropriate case.
    Espada v. Lugo, 
    312 F.3d 1
    , 4-5 (1st Cir. 2002) (concluding from
    3 The Puerto Rico Supreme Court has recognized an exception
    to a plaintiff's actual or deemed knowledge triggering the one-
    year limitations period: "[w]here the tortfeasor, by way of
    assurances and representations, persuades the plaintiff to refrain
    from filing suit, or otherwise conceals from the plaintiff the
    facts necessary for her to acquire knowledge, the statute of
    limitations will be tolled."     Alejandro-Ortiz, 756 F.3d at 27
    (citing Rodríguez-Surís, 
    123 F.3d at 16
    ). It is, however, "only
    the assurances of the tortfeasor, and not those of a third party,"
    that can lead to such tolling. 
    Id. at 29
    . Neither party invokes
    this principle of Puerto Rico law, so we need not mention it again.
    - 6 -
    the evidence in the record that a jury could properly find the
    plaintiff had been diligent in investigating the cause of her
    injury); Villarini-García, 
    8 F.3d at 86
     ("[W]hether a plaintiff
    has exercised reasonable diligence is usually a jury question."
    (quoting Bohus v. Beloff, 
    950 F.2d 919
    , 925 (3d Cir. 1991))); see
    also id. at 87 ("[E]ven where no raw facts are in dispute, the
    issues of due diligence and adequate knowledge are still ones for
    the    jury    so   long   as    the   outcome   is    within    the    range   where
    reasonable men and women can differ.").
    Generally speaking, the statute of limitations is an
    affirmative defense with the defendant bearing the burden of
    establishing that a claim against it is time-barred.                     Asociación
    de Suscripción Conjunta del Seguro de Responsabilidad Obligatorio
    v. Juarbe-Jiménez, 
    659 F.3d 42
    , 50 n.10 (1st Cir. 2011).                        But a
    plaintiff who, like Rivera, sues more than one year after the date
    of    injury    "bears     the   burden   of   proving    that    she    lacked   the
    requisite 'knowledge' at the relevant times."                    Alejandro-Ortiz,
    756 F.3d at 27 (quoting Hodge v. Parke Davis & Co., 
    833 F.2d 6
    , 7
    (1st Cir. 1987)).          Put a little differently, to avoid having her
    claim barred as untimely, the plaintiff must show (perhaps by
    convincing a jury) that despite her diligence in pursuing her legal
    rights, she did not gain enough knowledge to bring suit until
    sometime after the date of her injury.                Such a showing will result
    - 7 -
    in the one-year clock beginning to tick on some date after the
    injury.4
    With these basic principles in hand, we now turn to what
    happened to Rivera and the facts relevant to when the statute of
    limitations began to run.    Except for a couple instances (which
    we'll point out as we go along), these facts are not contested.
    Rather, their legal consequence is what's at stake.
    BACKGROUND
    1.   The Accident and the Ranch
    Rivera was hurt on July 4, 2009, when she was thrown
    from a rented horse she was riding as part of a guided tour on
    4 Because our summary of Puerto Rico's statute of limitations
    law is sufficient for us to decide the appeal before us, we have
    not given an exhaustive description of it. Indeed, Puerto Rico
    law sets forth several other mechanisms by which the one-year
    period may be tolled, and we address these only to the extent
    necessary to decide this appeal. We also note that, according to
    a certified translation of a Puerto Rico Supreme Court opinion
    submitted by the parties, approximately two months before the
    plaintiffs filed their complaint in the federal district court,
    the Puerto Rico Supreme Court overruled longstanding state law
    that automatically tolled the statute of limitations against all
    joint tortfeasors provided that suit was timely brought against at
    least one of them. See Fraguada Bonilla v. Hosp. Aux. Mutuo, 
    186 D.P.R. 365
     (P.R. 2012). (And we note that since "Puerto Rico is
    a state for diversity-jurisdiction purposes," Rodríguez v. Señor
    Frog's de la Isla, Inc., 
    642 F.3d 28
    , 32 (1st Cir. 2011), our
    reference to "state law" is appropriate in this diversity case.)
    According to the parties' certified translation, henceforth "the
    statute of limitations must be tolled separately for each joint
    tortfeasor," in light of the Puerto Rico Supreme Court's holding
    that "the timely filing of a complaint against an alleged joint
    tortfeasor does not toll the statute of limitations against the
    rest of the alleged joint tortfeasors."     Fraguada Bonilla, 186
    D.P.R. at 389 (certified translation at 8).
    - 8 -
    property owned by Florencio Berríos ("Berríos").                   Berríos used the
    land as a ranch, or farm, which he operated through his own
    corporation, Centro Ecuestre Madrigal, Inc. ("Madrigal, Inc.").5
    But, as it turns out, Madrigal, Inc. did not own the horse Rivera
    was riding, nor did it (or any of its employees) own the horse-
    rental business or conduct the tour she'd been on.                           Rather, a
    completely separate company owned by Gerardo Calderón ("Calderón")
    -- Pasión Ecuestre, Inc. ("Pasión") -- owned the horse Rivera
    rented, and it put on the tour as part of its horse rental business
    conducted from Berríos's property.
    Pasión operated its business pursuant to a five-year
    lease      (effective    June    15,    2007   through      June      13,   2012)   with
    Madrigal, Inc.6         The lease indicated that Pasión was allowed to
    use Madrigal, Inc.'s premises to "keep its saddle horses for rent
    by the general public."           In addition to payment of monthly rent,
    the lease stipulated that "[a]ll liability waivers used by [Pasión]
    when       renting   horses     must    clearly     and    precisely        state   that
    [Madrigal,      Inc.]    has    no     relationship       with   or    obligation     to
    5
    Madrigal, Inc. used the name "Hacienda Madrigal" as its
    "doing business as" identity. To keep things clear, we'll simply
    refer to the business as Madrigal, Inc.
    6
    With respect to that lease, Madrigal, Inc. was "represented
    by its President, [Berríos]," who signed on the corporation's
    behalf. The lease does not indicate that Berríos signed in his
    personal capacity.
    - 9 -
    [Pasión], and furthermore that [Madrigal, Inc.] is released from
    any liability to [Pasión's] customers."
    Rivera had gone to the ranch with her husband and a
    family friend after seeing advertisements for horse riding at
    Madrigal, Inc.'s farm.    This friend apparently wanted the outing
    to be his treat, and so he paid for it on his credit card.   Before
    setting out on her ride, Rivera signed a written liability release
    ("Release") agreeing that neither Madrigal, Inc. nor Pasión would
    be liable in the event she suffered any injury.7
    Two of Pasión's employees acted as the group's guides.
    One rode at the front to lead the way, and the other brought up
    the rear.     At some point during the ride, the rear guide rode
    quickly from the back to the front of the line.     In doing so, he
    7 The document purported to serve as a release of all claims
    against more than just these two companies, as it also listed their
    "officers, directors, managers, agents and representatives in
    their individual and corporate capacities." Here's the legalese:
    I, Angela Rivera, of legal age, on my own
    behalf and on behalf of any conjugal
    partnership,    freely,     consciously    and
    voluntarily release Hacienda Madrigal, Centro
    Ecuestre Madrigal, Inc., Pasión Ecuestre, Inc.
    and its officers, directors, managers, agents
    and representatives in their individual and
    corporate capacities and their successors and
    subsidiaries, fully and absolutely from any
    liability directly or indirectly related to
    recreational or any other kind of activities
    carried out, sponsored, held, performed or
    promoted in any way by myself or any minor in
    my care at Hacienda Madrigal . . . .
    - 10 -
    passed close to Rivera's horse, which spooked.   Rivera was thrown
    from her horse after she proved unable to maintain control of the
    animal.
    This appeal, at least with respect to Pasión (and to a
    lesser extent, Calderón), is not primarily about the jury's finding
    of liability.8   The parties, rather, have focused on Pasión's and
    Calderón's claims that Rivera failed to sue the right parties in
    time and, therefore, the statute of limitations bars her and her
    husband's claims.    So before going further, we need to discuss
    what else was going on at Madrigal, Inc.'s property in 2009 and
    lay out the cast of characters important to the legal analysis to
    come.
    On the date of Rivera's fall, Pasión was not the only
    horse-based business at Madrigal, Inc.'s property.        A second
    corporation, Criadero La Gloria (owned and operated by Edgardo
    Vélez ("Vélez")), leased land and 108 stables there.   Criadero La
    Gloria provided boarding services for off-property horse owners.
    Its clients would come to Madrigal, Inc. to ride their horses and
    use the ranch's facilities.    Like Pasión, this company conducted
    8
    Madrigal, Inc. and Calderón do raise arguments that they
    are separate and distinct from Pasión and, therefore, are not
    liable for the negligence of Pasión's employees.       Since the
    majority of the parties' arguments on appeal focus on the statute
    of limitations issue, we'll deal with that first. Once we take
    care of that, we'll circle back and get into these other grounds
    of appeal.
    - 11 -
    business pursuant to a lease.          The parties to this lease, dated
    June 1, 2009, were Vélez, Criadero La Gloria, Berríos (the property
    owner), and another of Berríos's companies, Agro Montellano, Inc.9
    The lease indicated that Criadero La Gloria was leasing the land
    and   stables   (along   with   some   other    facilities)   in   order    to
    "[m]anage a stable leasing business for horses."
    Thus, when Rivera took her tumble on July 4, 2009,
    Criadero La Gloria's horse boarding business had no interest at
    all in Pasión's horseback rental business.            Also, since Pasión
    owned its own horses, Pasión did not rent out any of the ones
    boarded in Criadero La Gloria's 108 stables.
    In the late summer or early fall of 2009, Calderón
    figured out that Pasión could no longer afford to stay in business
    because it was costing him more money to feed his horses than he
    was bringing in. So, and with Berríos's approval, Calderón offered
    to sell his horse renting and touring business to Vélez.              Vélez
    agreed, and by the end of November 2009 the transaction was
    complete.
    To further complicate things, on July 4, 2009, Madrigal,
    Inc. had a non-horse-based business operating on the premises.
    Restaurante El Estribo (which was separate from Madrigal, Inc.,
    Pasión, and Criadero La Gloria), operated a restaurant there.              And
    9Similar to Madrigal, Inc.'s lease with Pasión, Berríos
    signed this one as Agro Montellano, Inc.'s "Executive President."
    - 12 -
    there's   yet   another    company   we    have   to   identify,   Integrand
    Assurance Company.        Integrand wrote a single general liability
    policy that covered Madrigal, Inc., Pasión, and Criadero La Gloria,
    and which was effective on the date of Rivera's accident. Berríos,
    through   Madrigal,   Inc.    paid   for    the   policy,   and    the   other
    corporations operating at Madrigal, Inc.'s property reimbursed him
    for their share of the premium.
    Ultimately, the plaintiffs brought suit against all of
    the individuals and companies we have just mentioned, but they did
    not sue them all right off the bat.               The travel of this case
    through the state and federal court systems is critical to our
    analysis of the parties' statute of limitations arguments.               Thus,
    we must give special attention to the dates on which various
    parties were brought into the litigation.          Our rundown is based on
    testimony and exhibits introduced at trial, as the statute of
    limitations was a hotly-contested issue there, and each side called
    witnesses and introduced evidence speaking to it.
    2.   State Court Proceedings
    The plaintiffs retained Attorney Francisco Torres Díaz
    ("Attorney Díaz") to represent them.         On June 11, 2010, within the
    one-year statute of limitations, the plaintiffs initially filed
    suit in Puerto Rico state court against Berríos and Madrigal, Inc.
    -- the two parties Attorney Díaz had identified in his research as
    being potentially liable.       Rivera made a personal injury claim,
    - 13 -
    while her husband's was for loss of consortium.10                  Berríos's
    personal   lawyer,     Yesenia   Ramos   Talavera    ("Attorney    Ramos"),
    initially defended both Berríos and Madrigal, Inc. in state court.
    The plaintiffs served written interrogatories on January
    1, 2011.   Several were geared towards identifying the name of the
    individual that owned the horseback riding business operated on
    Madrigal, Inc.'s property.       Others sought disclosure of the nature
    of the relationship between the horseback riding business and
    Madrigal, Inc.
    In early February of 2011 -- before the defendants
    answered the interrogatories -- the parties then in the case
    (plaintiffs   Rivera    and   her   husband    Hernández,   and   defendants
    Berríos and Madrigal, Inc.) jointly filed in Puerto Rico superior
    court a document known as a Case Management Report ("Report").
    This Report is made in accordance with Rule 37.1 of Puerto Rico's
    Rules of Civil Procedure which, the parties tell us, is the "local
    law equivalent" of Fed. R. Civ. P. 16.         The Report essentially set
    forth a joint discovery plan, and was signed by Attorney Ramos as
    10 The parties have not included a copy of the actual state
    court complaint in their joint appendix. As such, our description
    of it is based on the parties' representations rather than a review
    of the document itself.
    - 14 -
    counsel for Berríos and Madrigal, Inc., and Attorney Díaz for the
    plaintiffs.11
    The     Report   described   the   discovery     still    to     be
    completed, identified particular documents required by each side
    as part of its case, and named various individuals the parties
    anticipated deposing.          The Report indicated the answers to the
    plaintiffs'         interrogatories   remained    outstanding.         It    also
    represented that the lease agreement "[b]etween Defendants and the
    horse rental operator" was "in possession of the [d]efendants" and
    that the deadline to deliver it to the plaintiffs was April 11,
    2011.        The defendants did not, however, specifically identify
    Calderón or Pasión as the horse rental operator in Report.
    Attorney    Ramos   served   her   clients'    answers    to    the
    plaintiffs' interrogatories on March 7, 2011. Berríos had answered
    them and signed in his "personal capacity and as president of"
    Madrigal, Inc.        The answers twice identified "Gerardo Calderón" as
    the owner of the horse rental business.             Berríos further stated
    there was a lease agreement between Madrigal, Inc. and Calderón's
    business, and that he'd attached a copy of it to the answers.12
    11
    In this regard, the Report appears to be a close analog to
    the written discovery plan described in Fed. R. Civ. P. 26(f).
    12
    This representation led to a dispute at trial, which we
    will discuss in more detail later. For now, it's enough to know
    that the defendants insisted they'd produced the lease between
    Madrigal, Inc. and Pasión in effect on the date of Rivera's
    accident, while the plaintiffs maintained that what was actually
    - 15 -
    The written answer did not, however, specifically mention the name
    of Calderón's business (Pasión), and it further stated that Berríos
    did not know Calderón's address.
    The plaintiffs amended their state court complaint on
    August 30, 2011 to add Madrigal, Inc.'s and Berríos's liability
    insurer, Integrand, as an additional defendant.13       The amended
    complaint did not assert any claims against Pasión, Calderón,
    Vélez, or Criadero La Gloria.     At some point after the insurance
    company was added, Berríos's personal lawyer, Attorney Ramos,
    withdrew and new defense counsel, Eduardo Cobian-Roig ("Attorney
    Cobian") entered.
    Discovery continued, and the plaintiffs deposed Berríos
    in October 2011.     Attorney Cobian represented the defendants at
    the deposition.     Berríos testified -- using the present tense --
    that Vélez, through his company Criadero La Gloria, rents the
    stables at Madrigal, Inc.'s ranch.    When plaintiffs' counsel asked
    Berríos, "Who is the owner of Centro Ecuestre Madrigal, Inc.?"
    attached was a copy of the lease between Agro Montellano, Inc.
    (another of Berríos's corporations) and Criadero La Gloria,
    executed by Vélez. Assuming the plaintiffs are correct, from all
    that appears in the record they made no attempt to follow up with
    Attorney Ramos about why she had produced a contract that did not
    so much as mention Calderón.
    13 Remember, under the then-existing law, the timely filing
    of a complaint against one joint tortfeasor automatically tolled
    the statute of limitations with respect to all other joint
    tortfeasors. See n.4, supra.
    - 16 -
    Berríos answered (incorrectly, we might add):                     "Centro Ecuestre
    Madrigal       Inc.     That   was   operated     before     um   .    .    .   Gerardo
    Calderón."14          Plaintiffs'    counsel     did   not   pose     any   follow-up
    questions about Calderón's involvement at the property, nor did he
    inquire who Calderón is or ask about the timeframe during which
    Calderón had a business relationship with Madrigal, Inc.
    A little later in his deposition, Berríos testified
    (again incorrectly) that Criadero La Gloria operated the horse
    rental business on the date of Rivera's accident.                   This statement,
    the parties now agree, was incorrect -- on July 4, 2009, Vélez's
    Criadero        La    Gloria   operated    the     boarding       business,       while
    Calderón's company Pasión ran the horse rental business.                        Yet, no
    one appears to have picked up on this error at the time it was
    made.
    Calderón's name came up one more time at the October
    2011 deposition. Although the context of how this came about isn't
    quite clear, it seems that plaintiffs' counsel (Attorney Díaz) was
    offhandedly telling Berríos about a time when he himself had gone
    to Madrigal, Inc. to ride horses and managed to lose a set of car
    keys.        The following exchange took place:
    Q. [by Atty. Díaz] Yes, I lost one of those
    keys there and I learned how much they cost.
    Um . . . Well . . .
    14
    This question referred to Madrigal, Inc., which no one
    disputes Berríos himself owned.
    - 17 -
    A. [by Berríos] I think that was when... when
    it was Gerardo.[15]
    Q.   No that was before, that was before.
    A.   Yes, yes.
    Q.   I'm talking about 2006, 2005 back then.
    Again, no one asked who Gerardo is or posed any follow-up questions
    about his involvement on the property.
    Thus, at the end of Berríos's deposition, the substance
    of his testimony regarding two facts was wrong: not only did he
    say that that Criadero La Gloria (rather than Pasión) operated the
    horse rental business on July 4, 2009, but he also testified that
    Gerardo Calderón had run Madrigal, Inc. -- Berríos's own company
    -- at some point in the past.    The record discloses no effort from
    anyone on either side to probe any inconsistencies or to clear up
    either misstatement.
    The plaintiffs voluntarily dismissed their complaint
    without prejudice in April 2012, ostensibly because they had moved
    to Nebraska.     As non-residents of Puerto Rico, if they continued
    to litigate in state court, the plaintiffs could have been required
    to put up a bond to pay costs should they lose the case.    They did
    not join (or seek to join) Calderón, Pasión, Criadero La Gloria,
    or Vélez before dismissing the state court complaint.
    15   Recall that Gerardo is Calderón's first name.
    - 18 -
    3.     The Federal Case
    On October 11, 2012, almost exactly one year after
    Berríos's deposition and six months after they dismissed their
    state court complaint, the plaintiffs filed a personal injury
    action grounded on diversity in the federal district court in
    Puerto     Rico.16      The    federal    complaint   contained   the   same
    substantive allegations from state court, but it brought in a few
    new defendants.       In total, the named defendants were Berríos; his
    wife Irma Sara Casillas ("Casillas"); the "conjugal partnership
    composed     by"     Berríos    and   Casillas;   Madrigal,   Inc.;     Agro
    Montellano, Inc.; Criadero La Gloria; Vélez; and Integrand.             The
    plaintiffs amended their complaint as-of-right fewer than twenty-
    one days later, see Fed. R. Civ. P. 15(a)(1) (describing when a
    party may amend its pleading without leave of court), but still
    did not assert claims against Calderón or Pasión.           And along with
    the change in court came a change in plaintiffs' counsel, with
    16 The original defendants -- Berríos and Madrigal, Inc. --
    do not contend that the statute of limitations bars the federal
    complaint against them. This is because Puerto Rico law contains
    a "restart rule" that gives a plaintiff one year from the date of
    a dismissal without prejudice to re-file an action against any and
    all defendants that had been timely joined. Rodríguez v. Suzuki
    Motor Corp., 
    570 F.3d 402
    , 408 (1st Cir. 2009) ("The usual rule
    under Puerto Rico law is that the filing of a judicial action tolls
    that statute of limitations and, if the action is dismissed without
    prejudice, the limitations period is reset and starts to run again
    from that date."). As we noted earlier, the initial state court
    complaint against Berríos and Madrigal, Inc. was timely.
    - 19 -
    Attorney José Ubarri ("Attorney Ubarri") taking over from Attorney
    Díaz.         Attorney Cobian continued to represent all the named
    defendants in federal court.17
    Pursuant to Federal Rule of Civil Procedure 26(a)(1),
    the defendants served their Initial Disclosures on January 30,
    2013.        In accordance with that Rule, the defendants were required
    to   disclose         the   name    "of    each     individual     likely     to    have
    discoverable          information    --    along     with   the   subjects    of    that
    information -- that the [defendants] may use to support [their]
    claims or defenses . . . ."               Fed. R. Civ. P. 26(a)(1)(A)(i).
    The    defendants'        response     included     the     following:
    "Gerardo       Calderón     Lozano    --    Owner     and   administrator      of    the
    horseback riding business in Hacienda Madrigal, at the time of the
    incident alleged in the complaint."                The defendants also indicated
    they would rely on the lease agreement between Madrigal, Inc. and
    Pasión to support their defenses.                     It was at this time, the
    plaintiffs claim, that the defendants first produced Pasión's
    lease and first identified Calderón as the owner of the horse
    rental business.
    Two weeks later, on February 15, 2013, the plaintiffs
    moved for leave to file a Second Amended Complaint.                          This time
    17
    Attorneys Ubarri and Cobian also represent the parties in
    this appeal.
    - 20 -
    they wanted to name Pasión and Calderón as additional defendants.18
    The plaintiffs did not make any argument in their motion geared
    specifically towards tolling the one-year statute of limitations.
    Instead, they said they'd been unaware of Calderón's ownership of
    the horseback riding business and of the contract between Madrigal,
    Inc. and Pasión until the defendants served their Rule 26(a)(1)
    disclosures.
    The existing defendants had until March 4 to file an
    objection to the plaintiffs' motion to amend.        But we do not know
    whether or how they would have responded to that motion because
    the district judge, by a docket order and without explanation,
    allowed the motion to amend on February 22, 2013.
    Thereafter, the plaintiffs filed their Second Amended
    Complaint ("Complaint") on February 25, 2013.             The Complaint
    appears to reflect some continuing uncertainty on the plaintiffs'
    part about just who had put on the horseback riding tour.            For
    example, the Complaint alleges that Calderón, "along with Pasión
    Ecuestre, and/or El Estribo [the restaurant] and/or Edgardo Vélez
    and/or Criadero La Gloria operated the horseback riding business
    at Hacienda Madrigal under an agreement with [Berríos] and [Agro
    Montellano, Inc.]."      The Complaint went on to allege that Pasión
    (along    with   all   these   other   defendants)   negligently   caused
    18 They also sought to add the restaurant operating               on
    Madrigal, Inc.'s property, Restaurante El Estribo, Inc.
    - 21 -
    Rivera's injuries through failing to properly select, train, and
    supervise the tour guides.    The Complaint also set forth a strict
    liability theory against Madrigal, Inc., Calderón, and Pasión
    pursuant to Article 1805 of the Puerto Rico Civil Code, 
    P.R. Laws Ann. tit. 31, § 5144.19
    February 25, 2013, the day Calderón and Pasión were first
    brought into the case, is more than three-and-a-half years after
    Rivera's July 4, 2009 injury.    This posed a potential problem for
    the plaintiffs' claims against them in light of the one-year
    statute of limitations.     Indeed, Calderón and Pasión soon sought
    summary judgment for exactly that reason.      They argued the case
    should not go to a jury because the plaintiffs' claims are time-
    barred and that the limitations period cannot be tolled because
    the plaintiffs failed to diligently work to learn the identity and
    importance of Calderón and Pasión.
    The district judge denied the motion in a brief written
    order.    He stated first that "[e]vidence concerning the name and
    identity of the correct parties was not made apparent until October
    2012."    So, the judge ruled, the plaintiffs' February 2013 "motion
    19 This section provides, "[t]he possessor of an animal, or
    the one who uses the same, is liable for the damages it may cause,
    even when said animal should escape from him or stray.         This
    liability shall cease only in case the damage should arise from
    force majeure or from the fault of the person who may have suffered
    it." 
    P.R. Laws Ann. tit. 31, § 5144
    .
    - 22 -
    to join Pasión Ecuestre as a party has occurred within one year of
    that time and is well taken."            The judge went on, stating that
    summary judgment would be denied because "[d]isputed material
    facts    remain    concerning   the   responsibility   and    role    of   each
    defendant in this case."
    The defendants filed a motion for reconsideration, which
    the district judge denied.          He wrote in another short order that
    he denied the "original [summary judgment] motion because the
    plaintiffs will have an opportunity at trial to present evidence
    of their diligence." At this point in the case, the district judge
    evidently viewed the statute of limitations issue as presenting a
    jury question.
    4.     Trial
    Not     surprisingly,     Madrigal,   Inc.'s     and    Calderón's
    statute of limitations defense was a hotly-contested issue at
    trial.    Aware of their burden to demonstrate grounds for tolling
    the limitations period, the plaintiffs put on evidence of their
    own diligence in seeking to identify and sue Pasión and Calderón.
    First up was Rivera's husband, Hernández.              In addition
    to testifying about how the accident occurred, he told the jury
    about their efforts to identify and sue Pasión and Calderón.                 He
    testified that after he and his wife filed their lawsuit in state
    court,    the     initial   defendants    (Berríos   and   Madrigal,       Inc.)
    questioned whether he or his wife had even been on the premises on
    - 23 -
    July 4, 2009.       So Hernández asked his friend, who had paid for the
    ride, to give him a copy of a receipt for that day.                 Hernández's
    friend ended up emailing him a copy of a credit card statement
    showing      "the   date   that    indicated   we    had   been   there"   [i.e.,
    Madrigal, Inc.'s ranch] and the charge for the horse rental.                  Per
    Hernández, the statement showed the "name" of the company that put
    on the ride, but he didn't recall it any longer.20
    The plaintiffs called Berríos as part of their case in
    chief.       He testified that Madrigal, Inc. has become well-known,
    such that "[e]verybody that goes horseback riding says, let's go
    to Hacienda Madrigal," rather than to Pasión or Criadero La Gloria.
    Berríos told the jury that back in July of 2009, Calderón owned
    the rental business and operated it under the Pasión name, while
    at the time of trial it was being run by Vélez through Criadero La
    Gloria.       Berríos agreed that both Calderón and Vélez "us[ed] the
    name        Hacienda    Madrigal     to    promote     their      horse    rental
    operation[s]."         He also testified that he obtained insurance for
    Madrigal, Inc. and had Pasión and Criadero La Gloria named as
    insured entities on the policy, and that each company would pay
    him its corresponding share of the policy premium.
    20
    A copy of the credit card statement (which the defendants
    submitted in connection with their summary judgment motion) shows
    a July 4, 2009 transaction with Pasión.
    - 24 -
    The plaintiffs then called Attorney Díaz, the lawyer who
    had represented them in state court.          Díaz testified about the
    steps he took to identify potential defendants before he filed the
    complaint.    He figured out that the farm's name was Madrigal, Inc.
    and that it was owned by Berríos, so he filed the state court
    complaint against those two. After filing the complaint, he served
    interrogatories on the defendants, but the answers made no mention
    of Pasión or, for that matter, Criadero La Gloria.        He did admit,
    however, that the defendants identified Calderón as someone that
    may   have    knowledge   of    facts   relevant   to   the   complaint.
    Nevertheless, he said that the defendants attached to their answers
    a copy of the June 1, 2009 contract between Agro Montellano, Inc.
    and Criadero La Gloria.        Per his testimony, the defendants never
    produced to him a copy of the contract between Madrigal, Inc. and
    Pasión for the horseback riding business.
    In the middle of Attorney Díaz's testimony, the judge
    announced that the court would recess for lunch.          After sending
    the jury out, he had the following exchange with the attorneys:
    The Court: Counsel, don't go, because I want
    to discuss something here.      It is pretty
    obvious to me, it is pretty obvious to me that
    the answers to those interrogatories fail to
    disclose extremely important information that
    was in the hands of defendants.
    [Plaintiffs' Counsel]: I'm sorry, Your Honor?
    The Court:  Those answers, from what I've
    heard up to now . . . fail to disclose
    - 25 -
    extremely important information that was known
    to defendants . . . .      Whether it was on
    account of bad faith, . . . negligence,
    whether it was that the lawyer [Attorney
    Ramos] did not do her job correctly in
    figuring out the answers, whether it was that
    the Cobian law firm did not procure any
    additional information, I don't know and I
    don't care.
    But I'm telling you right now that the way
    this looks up to now, you have no Statute of
    Limitations defense. Is that clear?
    [Defense Counsel]:    It's clear, Your Honor.
    The Court:  Because I'm not going to allow
    that here. Is that clear?
    [Defense Counsel]:    Well --
    The Court: If you mess around with the truth
    in the answer to interrogatory, you pay the
    consequence.   The consequence is that the
    Complaint may be filed in time. Okay.
    In response, defense counsel indicated the defendants'
    state   court   lawyer,   Attorney   Ramos,   would   testify   that   she
    personally delivered a copy of the Madrigal, Inc.-Pasión contract
    to plaintiffs' counsel before answering the complaint, and then
    later attached a copy of that contract to her clients' answers to
    interrogatories.    The district judge's view, though, was that the
    defendants' answers should have explicitly stated that Calderón
    "is related to a corporation known as Pasión Ecuestre, Inc.," but
    "this information was not disclosed until 2011."         The judge said
    "[t]here must be a consequence when you screw around with answers
    - 26 -
    to interrogatories," and he warned defense counsel that he was
    "advancing to [him] what's coming."
    After lunch, Attorney Díaz resumed his testimony and
    described how he asked Berríos at his deposition about who ran the
    horse rental business.      Attorney Díaz told the jury that Berríos
    indicated -- more than once -- that Criadero La Gloria had been
    running it when Rivera was injured.           Attorney Díaz also denied
    that the defendants' first lawyer, Attorney Ramos, delivered a
    copy of the contract between Madrigal, Inc. and Pasión to him.
    And he further testified that, despite asking for them, he was
    never given a copy of Pasión's lease or a copy of the Release
    Rivera signed before going on her ride.            Attorney Díaz explained
    that he did not file suit against Calderón in state court because
    he was not "certain" who was running the horse rental business in
    July of 2009, and he did not want to assert claims against anyone
    who might have no liability for Rivera's injuries.
    Once the plaintiffs finished putting on their case in
    chief, which included the above-described statute of limitations
    evidence, it was the defendants' turn to present their defense.
    First, Calderón took the stand and testified that he did run Pasión
    in July of 2009, but that he sold the entire business to Vélez a
    few   months   after   Rivera's   injury.     On    cross-examination,   he
    acknowledged that he made use of Madrigal, Inc.'s name, with no
    objection from Berríos, to promote his business.              He did this
    - 27 -
    because Madrigal, Inc. was well-known while "Pasión Ecuestre was
    a corporate name that nobody knew."
    The defendants also called their lawyer from the state
    court action, Attorney Ramos.       She testified that Berríos was a
    client for whom she had done "a lot of contracts . . . and corporate
    law," so she agreed to take on the matter even though she does not
    handle   tort   cases.   Attorney   Ramos    told   the    jury   that   she
    personally went to Attorney Díaz's office and delivered a copy of
    the contract between Madrigal, Inc. and Pasión with the expectation
    that he would drop the claims against Berríos and Madrigal, Inc.
    When that didn't happen, Attorney Ramos testified that she again
    produced a copy of the Pasión contract along with her clients'
    answers to interrogatories.   She explained that she agreed to the
    wording in the Report stating that the defendants would produce
    the contract (as opposed to, had already produced it) because she
    "didn't mind" sending along another copy.
    After the close of evidence, defense counsel made a
    couple of motions to try to get various defendants out of the case.
    First, saying that he wanted to "simplify the case for
    the jury," counsel requested "a judgment as a matter of law
    dismissing all the defendants that are not the entity Pasión
    Ecuestre" or the insurance company, Integrand.            Counsel did more
    than just appeal to the judge's sense of practicality: he argued
    that "it's been established there is no evidence in the record
    - 28 -
    that relates them" -- meaning defendants other than Pasión and the
    insurer -- "with the rental business."                 He urged the court to
    conclude that there was no legal basis to hold any defendant apart
    from Pasión liable for Rivera's injuries.
    The district judge did not ask the plaintiffs what they
    thought about the defense motion.             Instead, the judge's response
    was, "I would say that at least the entities that appear in the
    release are technically speaking involved one way or the other."
    The Release, recall, listed "Hacienda Madrigal, Centro Ecuestre
    Madrigal, Inc., Pasión Ecuestre, Inc. and its officers, directors,
    managers,   agents    and    representatives      in    their   individual    and
    corporate capacities . . . ."
    The judge went on to, essentially, opine that it didn't
    matter which defendants remained in the case.               After all, he said,
    "the truth of the matter is the evidence in this case centers
    basically upon the horse renting enterprise, and doesn't really
    matter   whether     you    have   one   or    ten     or   [twenty]   or   three
    [defendants], because it's the same insurance eventually."                  Thus,
    "if the jury were to find in favor of plaintiff[s] against any one
    of them, any one of them, the deep pocket is the insurance company
    . . . [n]o matter how you look at it."            In sum, the judge clearly
    indicated that he was not inclined to dismiss the claims against
    Madrigal, Inc., Pasión, and their officers or directors, but that
    - 29 -
    he   would    let   the   other   defendants      --    with   the   exception   of
    Integrand -- out.
    Defense counsel next focused in on Pasión and said the
    claims against it should be dismissed because "[t]he case was not
    brought      in   one   year."    This   motion        brought   the   statute   of
    limitations issue to a head.21           "There is no way I'm going to do
    that, and I told you the reasons," was the judge's immediate
    response.
    The judge went on to state that, "without entering into
    credibility issues" regarding Attorneys Díaz and Ramos, he would
    instead rely on the (Puerto Rico Superior Court Rule 37.1) Report
    signed by "[b]oth lawyers" to conclude that the defendants had not
    produced Pasión's contract at the very beginning of the lawsuit.
    The judge took the Report's specific wording that the lease would
    be produced by a specific date as an indication that it had not
    already been turned over to the plaintiffs.                He further expressed
    his "view . . . that if Pasión Ecuestre was not included from the
    beginning, it wasn't because of negligence or because of anything
    21It also ensured that defense counsel had sought judgment
    as a matter of law for each and every defendant (again, with the
    exception of Integrand). With respect to Calderón, technically
    defense counsel did not invoke a statute of limitations defense
    and only sought judgement as a matter of law on the grounds that
    he did not personally operate the horse rental business.         On
    appeal, however, the plaintiffs do not argue that Calderón waived
    the statute of limitations defense as a result of defense counsel's
    failure to explicitly invoke this defense on his behalf when
    counsel moved for judgment as a matter of law.
    - 30 -
    of the sort.      It was because the looseness, if you will, the
    tropical nature of the discovery that was created, was done in
    Superior Court in Caguas, allowed that to happen."
    The   judge   concluded   that     "[t]here   is   no   question"
    plaintiffs' counsel had been attempting to identify and locate the
    proper parties to sue (i.e., Calderón and Pasión), but "the
    discovery betrayed him in that sense, and he relied on discovery
    that was improper." The judge made it clear that he would consider
    no further argument on the matter: "This is it.           This is finished.
    You will not convince me.       I already gave you a ruling, and this
    is it."
    After a recess, the judge returned to the defense's first
    motion for judgment as a matter of law -- the one seeking to
    dismiss everyone but Pasión -- and asked "[a]re we in agreement
    that we should give the jury a streamlined case regarding parties?"
    Defense counsel responded, "Defendants agree, Your Honor,"22 and
    the plaintiffs expressed their agreement as well.                   The court
    entered a Partial Judgment formally dismissing all claims against
    Vélez,    Berríos,   Casillas   and   the    conjugal     partnership    with
    Berríos, Agro Montellano, Criadero La Gloria, and Restaurante El
    22 We do not interpret the defendants' agreement with the
    district court's proposal to "streamline" the case for the jury's
    convenience as a waiver of any of the substantive defenses and
    arguments they had just raised.
    - 31 -
    Estribo.23       Accordingly, the only defendants listed on the verdict
    form were the parties named in the Release Rivera had signed --
    Madrigal, Inc., Pasión, and Calderón.
    The verdict form the court chose to submit to the jury24
    effectively treated the three remaining defendants as one entity,
    as it did not differentiate between theories of liability against
    each.        Instead, it simply asked whether the plaintiffs had proved
    "that the owner or possessor of the horse is liable," but the jury
    was not asked to determine which of the three defendants qualified
    as the "owner or possessor."        And continuing the theme of lumping
    all three together, the verdict form also asked whether force
    majeure "absolve[d] the Defendants of liability."25
    23
    The Partial Judgment mistakenly dismissed Integrand, but
    the parties worked this out after trial by amending the judgement
    to list Integrand as a liable defendant.
    24
    The defendants' proposed jury instructions separated the
    defendants out and provided for a separate verdict as to each one,
    but the district judge did not adopt them.
    25
    The district judge's written instructions to the jury
    explained the concept of force majeure in the following way:
    Force majeure means a superior force or event;
    an event that cannot be anticipated or
    controlled.   The term includes both acts of
    nature, like floods or hurricanes, and also
    acts of people.    It means that it becomes
    impossible to predict. It is the result of an
    event or effect that the parties could not
    have anticipated or controlled.
    None of the parties on appeal takes issue with the district
    court's formulation of force majeure.
    - 32 -
    Defense counsel took another stab at getting the statute
    of limitations defense to the jury by asking the district judge to
    instruct the jury on it.      The judge refused, saying "I already
    decided on the matter of law, Statute of Limitations.       So you
    cannot argue that before the jury."        In response to defense
    counsel's continued attempts to argue for the defense, the judge
    reiterated his position that "the discovery in this case would
    have led any reasonable person to be confused who the parties were
    . . . ."    With that, the district judge considered the matter
    "over."
    The jury returned a verdict for the plaintiffs, and the
    district court entered judgment against Madrigal, Inc., Pasión,
    and Calderón.   Those defendants then filed a post-judgment renewed
    motion for judgment as a matter of law.26      Much of the motion
    rehashed arguments made previously.    These defendants once again
    argued that the uncontroverted evidence demonstrated that only
    Pasión operated the horse rental business, meaning that neither
    Madrigal, Inc. nor Calderón could be held liable for the negligence
    of Pasión's employees.   And, like they did prior to and at trial,
    the defendants argued that the claims against Pasión are barred by
    the statute of limitations.   In a new wrinkle, the defendants also
    26 Integrand, though at that point dismissed from the case,
    joined this motion.
    - 33 -
    sought to apply the statute of limitations argument to Calderón
    and Integrand, as their prayer for relief sought dismissal of the
    "totality of the complaint on statute of limitation[s] grounds."
    Finally, the defendants told the judge that even if he did not
    agree that they were entitled to judgment as a matter of law, they
    should at the very least get a new trial on the statute of
    limitations issue.27
    The district judge denied the defendants' renewed motion
    for   judgment   as   a   matter    of   law   in   a   docket   order   without
    explanation.     Aggrieved, the defendants filed this timely appeal.
    DISCUSSION
    1.    Pasión, Calderón, and the Statute of Limitations
    Calderón and Pasión appeal the district judge's denial
    of their motion for judgment as a matter of law invoking the
    statute of limitations.28      They say the judge decided the issue --
    27
    The defendants also sought a new trial on a specific point
    of Puerto Rico's comparative negligence law, but we don't need to
    get into that as the defendants do not press the issue on appeal.
    28Integrand argues that it, too, may take advantage of the
    statute of limitations because it was not brought into the case
    until two years after Rivera's accident. Integrand, however, fails
    to acknowledge or address "the Puerto Rico Supreme Court's
    determination that a suit against an insurer may be filed up to
    one year after judgment is entered in a suit against the insured."
    Tokyo Marine and Fire Ins. Co., Ltd. v. Perez & Cia., De Puerto
    Rico, Inc., 
    142 F.3d 1
    , 8 (1st Cir. 1998) (citing Barrientos v.
    Gobierno De La Capital, 
    97 D.P.R. 552
    , 576-77 (P.R. 1969)).
    Because Integrand acknowledges that it insured each of the
    defendants against whom judgment was entered, its statute of
    limitations defense is without merit.
    - 34 -
    erroneously -- as a matter of law, and their brief extensively
    engages on this claim of error.      The plaintiffs have a very
    different take on what the judge decided.     On this point, they
    solely argue in their appellate brief that the district judge
    barred the statute of limitations defense not as a matter of law
    on the merits of the motion, but as a sanction for the defendants'
    having gone out of their way to hide the identities of the proper
    defendants to keep the plaintiffs from suing Pasión and Calderón
    until long after the statute of limitations had expired.29
    29 Because the defendants (appellants here) are the ones who
    took an appeal, they filed the initial brief in this Court in
    accordance with the Federal Rules of Appellate Procedure.       The
    plaintiffs (appellees here) then filed their own brief, after which
    the defendants filed a reply brief responding to the plaintiffs'
    arguments.
    The defendants' opening brief was premised (and focused
    entirely on) the notion that the district judge decided the statute
    of limitations issue as a matter of law. It did not even raise
    the possibility that the district judge might have barred the
    defense as a sanction. In their response brief, the plaintiffs
    not only said that the district judge sanctioned the defendants,
    but they also claimed the defendants waived any appellate argument
    that the sanction was improper since they didn't even mention the
    issue in their opening brief. According to the plaintiffs, even
    if the defendants (as they in fact did) used their forthcoming
    reply brief to discuss the propriety of the sanction, this would
    be too little too late to overcome the waiver.
    We have said that parties in the plaintiffs' position are
    "entitled to rely on the content of an appellant's brief for the
    scope of the issues appealed, and [an] appellant generally may not
    preserve a claim merely by referring to it in a reply brief or at
    oral argument." Pignons S.A. de Mecanique v. Polaroid Corp., 
    701 F.2d 1
    , 3 (1st Cir. 1983); see also Sandstrom v. ChemLawn Corp.,
    
    904 F.2d 83
    , 87 (1st Cir. 1990) (expressing concern in a situation
    in which "the appellee is given no fair chance to respond to a
    theory which emerges for the first time in the appellant's reply
    - 35 -
    The parties' disagreement about what happened in the
    district court complicates our work as a reviewing court.          And,
    regrettably, the record does not supply a ready answer: each side's
    characterization of the judge's actions finds at least some support
    there.
    We start with the plaintiffs' suggestion that the judge
    struck the defense as a sanction.      At the summary judgment stage,
    the district judge's review of the papers led him to conclude that
    the defense's success (or lack thereof) was dependent upon the
    jury's   resolution   of   contested   facts.   This   is   an   obvious
    indication that the judge did not believe it was appropriate to
    resolve the question as a matter of law in light of the expected
    evidence at trial.
    Then, in the midst of trial and immediately after hearing
    some of the plaintiffs' evidence about how they attempted to
    identify the right parties to sue (and before the defendants began
    brief and the court of appeals is left with but one side of a two-
    sided story").
    The defendants' briefing does not offend this principle. As
    we discuss in detail herein, the record does not make clear whether
    the district judge imposed a sanction or made a legal ruling when
    he kept the statute of limitations defense from going to the jury.
    The plaintiffs, in their appellate brief, are the ones who framed
    the court's decision as that of a sanction order. The defendants
    appropriately used their reply brief to challenge this assertion.
    See Holmes v. Spencer, 
    685 F.3d 51
    , 66 (1st Cir. 2012) (recognizing
    that an appellant's reply brief may be "the earliest point when it
    [is] logical to" address an argument raised by an appellee in its
    brief). Accordingly, we decline to make any finding of waiver.
    - 36 -
    calling their own witnesses), the district judge sent the jury to
    lunch and instructed the parties to remain in the courtroom.            He
    proceeded   to   characterize   the   defendants   as   having   "mess[ed]
    around with the truth," and "screwed around with answers to
    interrogatories."     The judge informed the defendants that they
    would "pay the consequence" of their actions and that he was "not
    going to allow" them to present a statute of limitations defense.
    He also made it abundantly clear that he thought the defendants
    were required to specifically identify Pasión in response to the
    interrogatories served on them in the state court case, and stated
    it was "pretty obvious" to him that the defendants' answers were
    inadequate.
    We are well-aware of the dangers of trying to glean tone
    of voice and demeanor from a cold transcript.           Nevertheless, the
    timing and wording of the judge's statements can readily and
    reasonably be interpreted as evincing his displeasure with the
    defendants' conduct in discovery based on the evidence put on by
    the plaintiffs.    Moreover, by stating "I'm not going to allow" the
    defense, the judge was speaking in terms of making a decision
    within his purview and up to his discretion as a trial judge, as
    opposed to simply applying Puerto Rico law on tolling to the
    specific facts of the case.       Thus, the record could be read to
    support the plaintiffs' assertion that upon hearing the evidence,
    - 37 -
    the judge found that the defendants engaged in discovery misconduct
    and struck their statute of limitations defense as a sanction.
    Yet, the defendants' position that the judge ruled as a
    matter of law instead of imposing a sanction is not devoid of
    record support either.          First, though the district judge voiced
    his   opinion     at    trial    that     Madrigal,     Inc.'s    and   Berríos's
    interrogatory answers should have identified Pasión by name, the
    judge never made an explicit, on-the-record finding that any
    defendant     violated      a    discovery     obligation        or   engaged   in
    misconduct.     Indeed, he never uttered the word "sanction" during
    or after trial.        Given the amount of attention paid to this issue
    both at trial and post-verdict, it would be logical to expect that
    if the judge had intended to apply a sanction, he would have said
    so explicitly at some point along the way.
    It also bears mentioning that the district judge did not
    address any of the testimonial discrepancies or make any findings
    related to the conduct of the trial attorneys' handling of their
    discovery obligations.          And he did not make a finding as to which
    contract    the        defendants       attached   to     their       answers   to
    interrogatories.        Factual findings on these issues, we believe,
    would likely have been necessary prerequisites to any ultimate
    finding of bad faith or discovery misconduct.
    Moreover, when the judge referenced "loose" discovery
    practices in Puerto Rico state court, he appears to have been
    - 38 -
    referring to his perception of the way discovery is generally
    conducted there, rather than a criticism specific to the defendants
    or Attorney Ramos.      And he also said the plaintiffs should not be
    penalized     because   of    the   "tropical    nature"   of    state   court
    discovery.     Indeed, he opined that, thanks to "the discovery in
    this case . . . any reasonable person" would be confused as to who
    the plaintiffs should have been suing given the multiplicity of
    individuals and companies providing services at Madrigal, Inc.'s
    property.     This wording calls to mind not a sanction, but the
    plaintiffs' success in meeting their burden to establish that they
    acted as a reasonably diligent person would in order to toll the
    statute of limitations.
    Thus, we do not believe the judge's focus on the parties'
    mutual    confusion     and   his   generalized    critique     of   discovery
    practices in Puerto Rico state court are necessarily indicative of
    an intent to sanction the defendants.           On the contrary, the judge
    explicitly stated after the close of evidence that he had decided
    "as a matter of law" not to submit the statute of limitations
    defense to the jury. This last statement -- especially considering
    that the judge never said he was sanctioning the defendants --
    lends further record support to the defendants' view that the judge
    made a legal ruling that the statute of limitations should be
    tolled.
    - 39 -
    Putting it all together, we simply cannot say with any
    confidence whether the judge struck the statute of limitations
    defense as a sanction or ruled on that issue as a matter of law.
    Coming down either way would require us to emphasize and rely on
    some of the judge's words, while ignoring and putting to one side
    others.   Guessing at what a district judge intended to do does not
    strike us as the proper way to go about deciding an appeal.
    "As     we   have   observed     on   several   occasions,        'some
    explication   of    the   trial   court's    reasoning     will      often   prove
    valuable to both the litigants and to the reviewing court.'"
    Francis v. Goodman, 
    81 F.3d 5
    , 8 (1st Cir. 1995) (quoting Souza v.
    Pina, 
    53 F.3d 423
    , 424 n.4 (1st Cir. 1995)) (discussing the need
    to remand given the lack of clarity as to why the district court
    concluded that exercising diversity jurisdiction was proper).
    Here, because the record on appeal can be fairly read to support
    each   party's     divergent   view   of    what   went    on   at    trial,    an
    explanation from the district court is more than valuable, it is
    essential for us to conduct a meaningful appellate review.                   This
    is especially so if the district judge intended to impose a
    sanction for discovery misconduct.          See Figueroa-Ruiz v. Alegria,
    
    905 F.2d 545
    , 549 (1st Cir. 1990) (holding that a district court
    is required to articulate why it is imposing a sanction "when the
    reason for the decision is not obvious or apparent from the
    record"); see also Navarro-Ayala v. Nunez, 
    968 F.2d 1421
    , 1427 n.5
    - 40 -
    (1st Cir. 1992) (recognizing that a district court's specific
    findings "help us better understand why a particular sanction has
    been deemed appropriate in respect to a particular instance of
    misconduct").
    Moreover, a definitive word from the district court
    will improve the quality of our ultimate decision because it will
    allow the parties to focus their arguments not on what they think
    the district court did, but whether or not the trial judge's
    decision should be affirmed, reversed, or modified.      Thus, "we
    feel it necessary to remand the case so that the district court
    may review its decision[]" striking the statute of limitations
    defense and "make known to us its reasons" for doing so. Anderson,
    
    105 F.3d at 769
    .30
    30 The parties seem to agree that if in fact the district
    judge sanctioned the defendants, he did so as a result of the
    defendants' conduct during discovery in Puerto Rico Superior
    Court.   We are, of course, mindful of the defendants' argument
    that a federal judge lacks the power to sanction a party for
    conduct occurring in a state court. See In re Lothian Oil, Inc.,
    
    531 F. App'x 428
    , 445 (5th Cir. 2013) (observing that a federal
    court's "inherent power to punish bad-faith conduct does not extend
    to actions in a separate state court proceeding"); Hunter v.
    Earthgrains Co. Bakery, 
    281 F.3d 144
    , 157 n.20 (4th Cir. 2002)
    (noting that a district judge "lacked authority under the federal
    rules to sanction [an attorney] for conduct occurring in state
    court"). We, however, can't tell what (if anything) the district
    court sanctioned or where, from the judge's perspective, any
    misconduct occurred. Accordingly, we note the argument has been
    raised, but we take no position on its merits and leave it to the
    district court to sort out (if necessary) in the first instance.
    - 41 -
    2.   Madrigal, Inc. and Calderón
    We come now to Madrigal, Inc.'s and Calderón's arguments
    that they cannot be held liable for Rivera's injuries.
    Madrigal, Inc.'s theory, first raised (as best we can
    tell) in its motion for summary judgment, is that it cannot be
    liable to the plaintiffs because it is merely a landowner and had
    nothing to do with the horse rental business.    See CMI v. Munc. of
    Bayamón, 
    410 F. Supp. 2d 61
    , 75 (D.P.R. 2006) ("The imposition of
    tort liability for the action of a third party arises only under
    certain exceptional circumstances.").       Calderón, for his part,
    says in his summary judgment offering that he is legally distinct
    from his corporation and, therefore, cannot be held personally
    liable for the negligence of Pasión's employees.        See Burgos-
    Oquendo v. Caribbean Gulf Refining Corp., 
    741 F. Supp. 330
    , 332
    (D.P.R. 1990) ("As a general rule, a person is only liable for his
    own acts or omissions and only by exception is a person liable for
    the acts or omissions of others.").
    Opposing the summary judgment motion, the plaintiffs
    argued that Madrigal, Inc.'s inclusion on the Release Rivera signed
    is evidence that the two companies operated the horse rental
    business together, which makes Madrigal, Inc. liable as a joint
    venturer.    They further argued that Madrigal, Inc. may be held
    liable on an apparent authority theory given the evidence adduced
    in discovery showing that Madrigal, Inc. knowingly allowed Pasión
    - 42 -
    to utilize Madrigal, Inc.'s better-known name and store of goodwill
    in   the   community    to   attract     customers    for   its      horse    rental
    business.     See Grajales-Romero v. Am. Airlines, Inc., 
    194 F.3d 288
    , 293 (1st Cir. 1999) ("Under Puerto Rico law, an apparent
    principal may be held liable for the acts of its apparent agent
    where the apparent principal's actions 'led the plaintiffs to
    reasonably    believe    [in    its]   representation'        of    authority    and
    control over the apparent agent, through the apparent principal's
    conduct,     including       its   'silence,         evasive        language     and
    appearances.'"     (alteration     in     original)    (quoting        Berríos    v.
    U.P.R., 
    16 P.R. Offic. Trans. 112
    , 122 (1985))).                     In addition,
    they argued that Calderón is personally liable for the negligent
    acts of his corporation's employees because Calderón, as Pasión's
    principal, operated the horse rental business at the time of
    Rivera's injury.       See 
    P.R. Laws Ann. tit. 31, § 5142
     ("Owners or
    directors of an establishment or enterprise are . . . liable for
    any damages caused by their employees in the service of the
    branches in which the latter are employed or on account of their
    duties.").
    In   denying      summary    judgment,     the        district    judge
    succinctly wrote that "[d]isputed material facts remain concerning
    the responsibility and role of each defendant in this case."                     And
    his order on the motion for reconsideration focused solely on the
    statute of limitations.        Clearly then, the judge thought there was
    - 43 -
    a jury question on at least one of the theories of liability
    against Madrigal, Inc. and Pasión.
    These arguments about Madrigal, Inc. and Pasión did not
    end with the summary judgment denial.      Before trial began, the
    defendants submitted proposed jury instructions that would have
    informed the jury they must find Berríos and his corporations
    (i.e., Madrigal, Inc.) not liable if they had no interest in Pasión
    other than as a lessor, or if they did not have control separate
    from that of a landowner over Pasión's activities, or if they did
    not share profits with Pasión from Pasión's horse rental business.
    Then, on the third day of trial, the defendants argued
    in their oral motion for judgment as a matter of law that the trial
    evidence proved Pasión was the only defendant that operated the
    horse rental business and, therefore, the claims against all other
    defendants should be dismissed.      The judge's response, which he
    made without asking the plaintiffs for their feedback, was to say
    that any entity listed on the Release (meaning Madrigal, Inc.) was
    "technically speaking involved" and would stay in the case.      He
    did not, however, explain why he concluded that Madrigal, Inc.
    could be liable for Pasión's negligence solely by virtue of it
    having been included on the Release.       Neither did he tell the
    parties why Calderón could be held personally liable.
    Before the case went to the jury, the defendants asked
    the judge to instruct the jury that if they find one defendant
    - 44 -
    liable, this alone does not mean that all defendants are liable.
    The defendants also proposed giving the jury a separate verdict
    form for each defendant in the case.            And the proposed form for
    Madrigal, Inc. would have told the jury that it was not liable
    unless the jury found that Madrigal, Inc. owned or operated the
    horse rental business on July 4, 2009.
    The judge did not oblige defense counsel's request to
    separate out the defendants or instruct the jury on different
    theories of liability.         The jury instructions he actually gave
    treated the remaining defendants (Madrigal, Inc., Calderón, and
    Pasión) as a single unit, and referred to the three collectively
    as "Defendants" without elucidating separate theories of liability
    against each.        Ditto with the verdict form, which simply asked
    whether the plaintiffs had "prove[d] that the owner or possessor
    of the horse is liable for the damages caused by it."
    Post-verdict,    the   defendants'      renewed   motion    for
    judgment as a matter of law argued that neither Madrigal, Inc. nor
    Calderón can be held liable because they "are separate and distinct
    entities from Pasión." They argued that none of the trial evidence
    tended   to   show    that   Madrigal,   Inc.   was   responsible   for   the
    horseback riding business.       Furthermore, the defendants said there
    was no evidence to support piercing the corporate veil to hold
    Calderón personally liable for Pasión's negligence.
    - 45 -
    In opposition, the plaintiffs made both procedural and
    substantive arguments.       They first took the position that the
    defendants' Rule 50(b) motion was dead on arrival because the
    defendants (1) failed to "raise a proper Rule 50(a) insufficiency
    of the evidence motion before the case was submitted to the jury,"
    and (2) did not object to the jury instructions after the court
    gave them.     Accordingly, the plaintiffs said the arguments had
    been procedurally defaulted and that the judge could summarily
    deny the defendants' motion.        They also reiterated the joint
    venture and apparent authority arguments they'd raised at summary
    judgment, only this time they referred to the evidence that came
    in at trial.
    The district court denied the defendants' post-trial
    motion in a docket order without explanation.       Because multiple
    legal theories had been advanced and were before the court, the
    district court's conclusions of law "are not discernible" from the
    docket order.       Francis, 81 F.3d at 7.   It is akin to a "margin
    order . . . not amenable to reliable appellate review under any
    standard."    Id.
    Moreover, though these arguments had been before the
    court previously, the limited record submitted for this appeal
    does not disclose what the judge thought about them before or at
    - 46 -
    trial.31    A further wrinkle is added by the plaintiffs' post-
    verdict argument that the defendants' renewed motion for judgment
    as a matter of law was procedurally defaulted and should be
    summarily   denied.     The   parties   have   not   provided   us   with   a
    transcript of the judge's oral instructions to the jury or of any
    post-charge discussion with the parties. So we cannot tell whether
    or not the plaintiffs' representation that the defendants failed
    to object to the given instructions is correct. In sum, the record
    on appeal sheds no light on whether the district judge relied on
    procedural or substantive grounds (or some combination) in denying
    the defense motion.32
    31 Except that the judge concluded at the summary judgment
    stage that at least one of those theories presented a jury
    question.
    32The plaintiffs' appellate brief is not particularly helpful
    either, as it focuses almost entirely on their view that the
    district court struck the statute of limitations defense as a
    sanction. In fact, they only briefly touch upon Madrigal, Inc.'s
    and Calderón's arguments, and even then their treatment of the
    issue does not extend beyond their observation that these parties
    are liable to them because the jury found the Release to be
    invalid. Such superficial treatment of the issue runs the risk of
    our finding it waived for inadequate briefing on appeal.       See
    United States v. Zannino, 
    895 F.2d 1
    , 17 (1st Cir. 1990). Here,
    however, the defendants have not asked us to find that the
    plaintiffs waived any arguments with respect to Madrigal, Inc.'s
    and Calderón's liability. So they have, essentially, waived their
    waiver argument. This, combined with the fact that we are already
    remanding on the statute of limitations defense, counsels against
    a finding of appellate waiver and allowing each side to present to
    the district court any argument it sees fit.
    - 47 -
    As with the statute of limitations issue, we will not
    rely on guesswork as the jumping-off point for our analysis.
    Prudence dictates that we remand for the judge to explain the
    grounds on which he denied the defendants' Rule 50(b) motion.
    CONCLUSION
    Based on the foregoing, the district court's denial of
    the defendants' renewed motion for judgment as a matter of law is
    vacated   and   this   matter   is   remanded   for   further   proceedings
    consistent with this opinion.        The district court is instructed to
    explain whether it barred the statute of limitations defense as a
    sanction or a matter of law (or, perhaps, on some other basis) and
    explain its reasoning for doing so.        It should also set forth its
    reasoning    with   respect     to   Calderón's   and   Madrigal,   Inc.'s
    liability. The district court, which may order briefing or convene
    a hearing on any remanded issue if deemed appropriate, is hereby
    instructed to render its decision on the defendants' renewed motion
    for judgment as a matter of law within ninety (90) days from the
    date of this opinion.     We retain appellate jurisdiction.
    - 48 -