LaChance v. Town of Charlton ( 2021 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 20-1103
    MICHAEL E. LACHANCE,
    Plaintiff, Appellant,
    v.
    TOWN OF CHARLTON; OFFICER JASON F. WHITE; OFFICER TIMOTHY A.
    SMITH; SGT. KEITH R. CLOUTIER,
    Defendants, Appellees.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MASSACHUSETTS
    [Hon. Timothy S. Hillman, U.S. District Judge]
    Before
    Howard, Chief Judge,
    Thompson, Circuit Judge,
    and Katzmann, Judge.*
    Héctor E. Piñeiro, with whom Robert A. Scott, Lizabel M.
    Negrón-Vargas, and Law Office of Héctor Piñeiro were on brief, for
    appellant.
    Bradford N. Louison, with whom Douglas I. Louison and Louison,
    Costello, Condon & Pfaff, LLP were on brief, for appellees.
    March 3, 2021
    * Of the United States Court of International Trade, sitting
    by designation.
    HOWARD, Chief Judge.       Michael Lachance ("Lachance") woke
    up at night gasping for air.     His wife called 911, and three police
    officers responded.     Lachance did not appear to be of sound mind.
    While attempting to restrain him, two officers ended up pushing
    Lachance onto a sofa-recliner (the "push"), which toppled over,
    then one of the officers kneeled on his back (the "kneel").
    Lachance sued the officers, Sgt. Keith Cloutier, Officer Timothy
    Smith, and Officer Jason White, and their employer, the Town of
    Charlton, Massachusetts ("defendants").         The district court found
    at summary judgment that the push and the kneel constituted two
    discrete   uses   of   force   and   granted   summary   judgment   to   the
    defendants as to the push on the basis of qualified immunity.
    After a jury trial, the court entered a directed verdict for the
    defendants on the remaining counts on the ground that Lachance
    failed to prove that any injury he suffered was caused by the
    kneel.   We affirm in part and vacate in part.
    I.
    A.
    In the middle of the night on January 4, 2014, Kimberley
    Lachance awoke to her bed shaking and a gurgling sound.1                 She
    noticed her husband, Lachance, convulsing, gasping for air, and
    1 We take the facts in this section from the submissions at
    summary judgment and present them in the light most favorable to
    Lachance as the non-moving party. See Zabala-De Jesus v. Sanofi-
    Aventis P.R., Inc., 
    959 F.3d 423
    , 427-28 (1st Cir. 2020).
    - 2 -
    foaming at the mouth beside her. Mrs. Lachance attempted to supply
    him with his inhaler, but he rolled off the bed, landing face-down
    onto the floor.   Somewhere along the way, Lachance bit his tongue
    and started bleeding from his mouth.    When Mrs. Lachance noticed
    that he had urinated on himself and his complexion was turning
    blue, she called 911.
    Officer Smith responded to the call and attempted to
    assess Lachance and supply him with oxygen, but Lachance got up
    and started stumbling down the hallway, pressing his hands against
    the walls for support and wearing only his underpants.     By this
    time, Sgt. Cloutier and Officer White as well as two EMTs had
    arrived.   All three police officers were aware that Lachance was
    experiencing some sort of medical emergency, but no one present at
    that time had deduced what was causing his symptoms.      Lachance
    pushed past the EMTs who were in his way, ignoring their questions
    about his condition and their requests that he stop moving and
    repeatedly asking, "What did I do?"
    Officers Smith and White officers flanked Lachance, each
    holding one of his arms, and repeatedly told him to stop walking.
    But Lachance continued walking, attempting to pull away from the
    officers and repeatedly asking what he did. He began to "wobbl[e]"
    and "stumble[]" his way toward the open kitchen door leading to a
    steep, icy stairway outside the second-story apartment, but the
    - 3 -
    officers redirected him toward a cloth La-Z-Boy recliner in the
    adjacent living room.
    According to Mrs. Lachance, the two officers then pushed
    Lachance onto the sofa-recliner "with a lot of force"; he landed
    in a seated position; the recliner tumbled over backward along
    with Lachance and the officers, one of whom landed on top of
    Lachance; and Lachance landed with his back on the recliner, still
    in a seated position.       Lachance's son Amahd, who witnessed the
    encounter from his bedroom doorway, described the force used as "a
    push, grab, follow through."       He described his father's fall onto
    the recliner as a "hard landing," "not the way that you would want
    to sit in it" but rather "more like he fell on the top of it."
    Amahd further described Lachance's subsequent fall onto the floor
    as another "hard landing" on his "back side-ish" and "shoulder
    blade" area, his body "laying on the ground" with the upper half
    on the kitchen's tile floor and the lower half on the living room's
    hardwood floor.
    "Immediately" after his fall, the officers "swarmed"
    Lachance.      Officers   Smith   and   White   got   up,   grabbed   one   of
    Lachance's arms each, and dragged him off the recliner and onto
    the kitchen floor behind it.      Lachance began flailing his arms and
    kicking his legs, screaming for his mother, and asking what he did
    wrong.      The three officers forcibly rolled Lachance onto his
    stomach.    Sgt. Cloutier and Officer White moved next to his upper
    - 4 -
    body, and Officer Smith straddled his legs.      Lachance kept trying
    to get up, so one of the officers kneeled down with one knee on
    the center of his back to keep him down.       Officer White placed a
    pillow under Lachance's head to stop him from banging it on the
    floor, Officer Smith put his legs in a figure-four leglock, and
    some combination of the officers pulled his arms behind his back
    and attempted to place handcuffs on him.        While Lachance was on
    the floor, Mrs. Lachance noticed bruising on his back, and Amahd
    heard someone yell that he was seizing.
    The   on-the-floor   scuffle    between   Lachance   and   the
    officers was over in a matter of seconds.           Sgt. Cloutier and
    Officer Smith ended up placing one set of handcuffs on one of
    Lachance's hands and one on the other and then connecting the two.
    EMTs brought a stretcher into the room, rolled Lachance onto it,
    then strapped him in.   Lachance was transported to the University
    of Massachusetts Medical Center.         Throughout the twenty-minute
    ambulance ride, he was kicking and thrashing about, so much so
    that he cut his wrists open.    When Amahd arrived at the hospital
    to visit his father, he noticed deep cuts on his father's wrists
    and bruising all over his back, ribs, and shoulders.      Lachance was
    diagnosed with cluster seizures and a T4-T5 compression fracture.
    He suffered back pain for over a year after the incident.
    - 5 -
    B.
    At trial, Amahd testified that the kneel was to the
    center of Lachance's back, and Mrs. Lachance specified that the
    kneel was to the center of Lachance's upper back.2          Mrs. Lachance
    further testified    that the   kneel    lasted no more than       thirty
    seconds.
    Lachance's medical expert, Alexander Chirkov, MD, opined
    to a reasonable degree of medical certainty that Lachance's T4-T5
    compression fracture was caused by him being pushed onto the
    recliner and not from any subsequent kneeling.         In a transparent
    but confusing effort to illustrate why he reached that conclusion,
    he testified about a photograph of a bruise on the left side of
    Lachance's   back   and   indicated    that   when   one   considers   the
    "direction" "[o]f the force when the person lay[s] down on the
    ground," it would have been "impossible to generate . . . [enough]
    compression to smash the vertebrae."          Dr. Chirkov did, however,
    note that while any kneeling on the T4-T5 discs was "not . . .
    going to accelerate the fracture," it "can make the problem worse"
    by causing "more compression of the nerves" and therefore "more
    pain."
    2 We take the facts in this section from the evidence offered
    at the jury trial and again present them in the light most
    favorable to Lachance. See Hernandez-Cuevas v. Taylor, 
    836 F.3d 116
    , 119 (1st Cir. 2016).
    - 6 -
    Dr.   Chirkov   testified    about   a   number   of    other
    photographs documenting Lachance's injuries.       In relevant part,
    Dr. Chirkov testified about a photograph of Lachance's upper back,
    indicating two bruises and attributing them to "pressure on his
    back, physical compression" of the sort "usually . . . see[n] . . .
    on restrained people."    He further testified about a photograph
    showing a brown bruise on Lachance's midline, which was "consistent
    with a compression mark" and "[a] restrained position."          In the
    end, he clarified that he found no injuries that Lachance suffered
    other than the T4-T5 compression fracture to be "of significance."
    C.
    Lachance filed a complaint in the District Court for the
    District of Massachusetts, alleging excessive force pursuant to 
    42 U.S.C. § 1983
     (Count I), assault and battery (Count II), a claim
    under Monell v. Dep't of Soc. Servs. of City of New York, 
    436 U.S. 658
     (1978), against the Town of Charlton (Count III), negligence
    (Count IV), and violations of the Americans with Disabilities Act
    ("ADA"), 
    42 U.S.C. § 12131
     (Count V).
    The defendants moved for summary judgment pursuant to
    Federal Rule of Civil Procedure 56.      The district court granted
    the defendants' motion as to the excessive force claim insofar as
    it was premised on the push, as well as the ADA claim, but it
    denied summary judgment on the remaining counts and expressed its
    intention to bifurcate trial of the Monell claim from trial of the
    - 7 -
    other claims.    The case proceeded to trial by jury on what remained
    of the excessive force claim as well as the state law assault and
    battery   and   negligence   claims.     At   the   close   of   trial,   the
    defendants moved for judgment as a matter of law pursuant to
    Federal Rule of Civil Procedure 50(a) on those three claims.              The
    court granted the motion as to all remaining claims, including the
    Monell claim for which the defendants had not moved for judgment
    as a matter of law, and entered a directed verdict for the
    defendants.
    This timely appeal followed.       We have jurisdiction under
    
    28 U.S.C. § 1291
    .
    II.
    On appeal, Lachance challenges the district court's
    orders: (1) granting the defendants' motion for summary judgment
    on the excessive force claim as to the push; and (2) granting the
    defendants' motion for judgment as a matter of law on the remaining
    four counts.3    We address each challenge in turn.
    A.
    We review a district court's grant of summary judgment
    de novo, reading the facts in the light most favorable to the non-
    3 Lachance does not challenge the district court's order
    granting the defendants' motion for summary judgment on the ADA
    claim. Therefore, we do not address it.
    - 8 -
    moving party and granting all reasonable inferences in his favor.
    See Irish v. Fowler, 
    979 F.3d 65
    , 73 (1st Cir. 2020).
    Qualified immunity is a doctrine that shields government
    officials from individual-capacity suits for damages under § 1983
    "when [they] ma[de] a decision that, even if constitutionally
    deficient,   reasonably    misapprehend[ed]     the   law   governing   the
    circumstances [they] confronted."         Taylor v. Riojas, 
    141 S. Ct. 52
    , 53 (2020) (quoting Brosseau v. Haugen, 
    543 U.S. 194
    , 198 (2004)
    (per curiam)).    Thus, police officers are immune from such suits
    unless "(1) they violated a federal statutory or constitutional
    right, and (2) the unlawfulness of their conduct was 'clearly
    established at the time.'" Irish, 979 F.3d at 76 (quoting District
    of Columbia v. Wesby, 
    138 S. Ct. 577
    , 589 (2018)).
    Because "[e]xcessive force claims are founded on the
    Fourth Amendment right to be free from unreasonable seizures of
    the person," such claims are "governed by the Fourth Amendment's
    reasonableness standard."     O'Brien v. Town of Bellingham, 
    943 F.3d 514
    , 530 (1st Cir. 2019) (internal quotation marks and citations
    omitted).     "Determining whether a particular use of force is
    reasonable    requires    consideration    of   the    totality   of    the
    circumstances," including (1) "the severity of the crime at issue,"
    (2) "whether the suspect pose[d] an immediate threat to the safety
    of the officers or others," and (3) "whether [the suspect was]
    actively resisting arrest or attempting to evade arrest by flight"
    - 9 -
    (the "Graham factors").       Gray v. Cummings, 
    917 F.3d 1
    , 8 (1st Cir.
    2019) (alterations in original) (second quoting Graham v. Connor,
    
    490 U.S. 386
    , 396 (1989)). This assessment of reasonableness "must
    be judged from the perspective of a reasonable officer on the
    scene."     Graham, 
    490 U.S. at 396
    .
    "The plaintiff bears the burden of demonstrating that
    the   law   was clearly established at         the     time   of   the   alleged
    violation, and it is a heavy burden indeed."               Mitchell v. Miller,
    
    790 F.3d 73
    , 77 (1st Cir. 2015).               In determining whether the
    unlawfulness of officers' conduct was clearly established, "the
    salient question . . . is whether the state of the law [at the
    time of the officers' conduct] gave [them] fair warning that their
    alleged     treatment    of   [the   plaintiff]      was   unconstitutional."
    Irish, 979 F.3d at 76 (alterations and omission in original)
    (quoting Hope v. Pelzer, 
    536 U.S. 730
    , 741 (2002)).                The answer to
    that question is "yes" when: (1) the law was "clear enough that
    every   reasonable      official     would    [have]    interpret[ed]     it   to
    establish the particular rule the plaintiff seeks to apply"; and
    (2) "[t]he rule's contours [were] so well defined that it [would
    have been] clear to a reasonable officer that his conduct was
    unlawful in the situation he confronted."              
    Id.
     (third and fourth
    alterations in original) (quoting Wesby, 
    138 S. Ct. at 590
    ).                   The
    rule establishing the conduct's illegality must be "dictated by
    [either] 'controlling authority' or 'a robust consensus of cases
    - 10 -
    of persuasive authority,'" the latter of which "does not require
    the express agreement of every circuit" but rather some sister
    circuit law can suffice.   
    Id.
     (first quoting Wesby, 
    138 S. Ct. at 589-90
    ).
    In the Fourth Amendment context, the "[s]pecificity" of
    the rule set forth in such precedent "is especially important,"
    because it can be "difficult for an officer to determine how the
    relevant legal doctrine," such as excessive force, "will apply to
    the factual situation the officer confronts."     City of Escondido
    v. Emmons, 
    139 S. Ct. 500
    , 503 (2019) (quoting Kisela v. Hughes,
    
    138 S. Ct. 1148
    , 1152 (2018)).         Of course, prior cases with
    materially similar facts are not necessary to clearly establish
    conduct's illegality; a "general constitutional rule" located in
    prior authority can suffice to defeat qualified immunity even in
    "novel factual circumstances."   Hope, 
    536 U.S. at 741
     (internal
    quotation marks and citations omitted).    But that is true only in
    an "obvious case," Brosseau, 
    543 U.S. at 199
    , where "any reasonable
    officer should have realized that [the conduct at issue] offended
    the Constitution," Riojas, 141 S. Ct. at 54.     As such, "relevant
    case law," where "an officer acting under similar circumstances
    . . . was held to have violated the Fourth Amendment," is "usually
    necessary" to overcome officers' qualified immunity.    Wesby, 
    138 S. Ct. at 590
     (first and second internal quotation marks and
    citations omitted).
    - 11 -
    With these principles in mind, we turn to the district
    court's summary judgment opinion.           The court granted summary
    judgment in favor of the defendants on Lachance's excessive force
    claim insofar as it was premised on the push, on the basis of
    qualified immunity.      It applied the two-part test for qualified
    immunity   as   articulated    above,   considering   first    whether   the
    officers' conduct violated Lachance's constitutional rights and
    next whether those rights were clearly established at the time.
    In doing so, the court severed its analysis of the push from the
    kneel.   The court noted that in Jennings v. Jones, 
    499 F.3d 2
     (1st
    Cir. 2007), and Rush v. City of Lansing, 644 Fed. App'x 415 (6th
    Cir. 2016), both this Court and the Sixth Circuit applied a
    similarly "segmented" approach in considering whether qualified
    immunity applied to certain uses of force but not others in an
    encounter.      The   court   reconciled   our   seemingly    contradictory
    approach in Alexis v. McDonald's Restaurants of Massachusetts,
    Inc., 
    67 F.3d 341
     (1st Cir. 1995), on the ground that each discrete
    use of force in that case was arguably independently excessive.
    The district court next considered the factors relevant
    to whether a use of force was unreasonable in violation of the
    Fourth Amendment, as set forth in Graham.             It found that "[a]
    reasonable juror could conclude that throwing a person -- who is
    not suspected of committing a crime or a threat to officers --
    over a sofa with enough force to break his back, and then using
    - 12 -
    the dangerous restraint technique of kneeling on his back, is an
    excessive use of force."    Although it is not apparent from the
    court's wording here, the court proceeded on the understanding
    that the push and the kneel were two independent excessive uses of
    force, as opposed to one combined excessive use of force.   Indeed,
    the court clearly assumed without deciding that the push was
    unreasonable by taking it as a given that the officers "used a lot
    of force," notwithstanding its dicta that even on that assumption,
    the push "may have been a reasonable use of force."4   It separately
    concluded that "kneeling on the back of a restrained person is
    unreasonable," and that the kneel, under Lachance's version of
    events, "was excessive."5
    The district court then found that "it was clearly
    established that [Lachance] had a constitutional right to be free
    from an officer kneeling on his back after he had been restrained,"
    4 In explaining why the push may have been reasonable despite
    its conclusion that the kneel was not, the district court
    distinguished its approach from that of Rasmussen v. City of New
    York, 
    766 F. Supp. 2d 399
     (E.D.N.Y. 2011). In that case, the court
    noted, the initial use of force was deemed to be excessive under
    Rasmussen's version of the facts and therefore informed the
    assessment of whether the subsequent use of force was excessive,
    
    id. at 405-06
    , whereas here the court held only that the subsequent
    use of force -- the kneel -- was undoubtedly excessive in
    Lachance's telling of events.
    5 Although these findings came in the context of the district
    court's analysis of whether Lachance's rights were clearly
    established, they plainly concern whether there was even a
    constitutional violation in the first instance. See O'Brien v.
    Town of Bellingham, 
    943 F.3d 514
    , 530-31 (1st Cir. 2019).
    - 13 -
    but that there were fact issues that bore on whether a reasonable
    officer would have understood that his conduct violated that right,
    namely whether an officer kneeled on Lachance's back at all and,
    if so, for how long.         However, the court found that it was not
    clearly established that the push, even assuming it was carried
    out with a lot of force, violated the Constitution under the
    circumstances.      The court noted that Lachance failed to point to
    any controlling or persuasive case law to show that his right to
    be free from such force was clearly established, although the court
    identified one out-of-circuit case that might support his position
    (citing Smith v. City of Troy, 
    874 F.3d 938
     (6th Cir. 2017)).                In
    fact,   the    court     added,    in-circuit   case   law   "suggests   that
    forcefully pushing a resistant plaintiff to the ground is not
    excessive" (comparing Therrien v. Town of Jay, 
    483 F. Supp. 2d 19
    ,
    26-27 (D. Me. 2007), with Ciolino v. Gikas, 
    861 F.3d 296
    , 303-06
    (1st Cir. 2017); Jacobson v. City of Nashua, 
    2002 WL 1349515
    , at
    *4 (D.N.H. June 19, 2002)).
    Lachance    argues   that   the   district     court   erred   by
    segmenting its analysis of the push and the kneel.             Then, assuming
    arguendo that the push could be severed from the kneel, Lachance
    cites the general rule in Graham and a series of purportedly
    factually analogous cases to show that it was clearly established
    - 14 -
    at the time that the push was a violation of his Fourth Amendment
    right to be free from the use of excessive force against him.6
    The defendants respond that the district court properly
    segmented its analysis of the push and the kneel, largely restating
    the court's reasoning.      They argue that the push did not violate
    Lachance's clearly established rights, asserting that we held for
    the first time in 2019, years after the incident, that "a jury
    could supportably find that the use of a Taser to quell a non-
    violent,   mentally   ill   person   who   is   resisting   arrest   to   be
    excessive force."
    7 Gray, 917
     F.3d at 20.
    6 Additionally, Lachance confusingly asserts that the district
    court "deprived [him] of the facts of his case at summary judgment"
    and cursorily asserts that the court "picked and chose arbitrarily
    which scenario it found more persuasive, including issues of
    causation, proximate cause and damages." Whatever arguments can
    be gleaned from these statements, they fail for lack of development
    and we do not address them.     See United States v. Zannino, 
    895 F.2d 1
    , 17 (1st Cir. 1990) ("[I]ssues adverted to in a perfunctory
    manner, unaccompanied by some effort at developed argumentation,
    are deemed waived.").
    7 The defendants also argue that we should adopt the Sixth
    Circuit's   excessive-force   framework   in  cases   of   medical
    emergencies as set forth in Estate of Hill by Hill v. Miracle, 
    853 F.3d 306
    , 314 (6th Cir. 2017), and that under that framework, the
    push was not excessive because it was reasonably necessary to
    protect Lachance and the EMTs. We need not reach this alternative
    ground for affirming the district court's decision because even if
    the push was excessive, it was not clearly established that it
    was.
    - 15 -
    1.
    There may be some tension in our cases about how to
    analyze multiple-force scenarios.8          In Jennings, we noted that an
    officer who used an "ankle turn control technique" to subdue an
    initially    resistant   suspect    would     arguably   reasonably   have
    "believe[d] that it was lawful to maintain the level of force he
    used even after [the suspect] ceased resisting," but that "an
    objectively reasonable officer in [the officer's] circumstances
    would not have believed that it was lawful to increase the amount
    of force that he used after [the suspect] ceased resisting and
    stated that [the officer] was hurting him."           499 F.3d at 4, 19.
    Our reasoning in Jennings was thus indicative of a segmented
    approach, namely between a decision -- at the moment that Jennings
    stopped resisting -- to maintain the level of force applied in
    utilizing the ankle turn control technique or to increase the
    amount of force applied in utilizing that technique.
    8 We use "multiple-force scenarios" for simplicity's sake,
    but we acknowledge that it is something of a misnomer. Certainly,
    a change in the type or degree of force used, or a pause in which
    no force is used, are each indicative of distinct uses of force
    that might best be analyzed separately.     But one could imagine
    scenarios in which the same type and degree of force is used
    continuously such that it manifests as a singular use of force,
    yet a segmented approach is still warranted because that force at
    some point may have crossed the threshold from the reasonable to
    the unreasonable. Consider, for example, the use of a chokehold
    to restrain a violent suspect, but then continuing to use the
    chokehold long after the suspect appeared to lose consciousness.
    Nevertheless, because Lachance has conceded that the push and the
    kneel were separate uses of force, we need not dwell on this point.
    - 16 -
    Whereas    previously     in     Alexis,   we     considered       the
    following set of facts in relation to an excessive force claim:
    Alexis was told by [an officer] that she was being placed
    under arrest. Then, without asking or directing Alexis
    to get up from the table, [that officer] suddenly and
    violently grabbed and pulled her bodily from the booth
    and across the table, handcuffed her hands tightly
    behind her back, and, with the help of [another officer],
    dragged her from the booth, bruising her legs in the
    process. Insisting that she was "not resisting arrest,"
    Alexis asked the officers to allow her to walk out.
    Instead, they hoisted her by her elbows and carried her
    from the restaurant to the police car, where [the first
    officer] pushed her into the car with the instruction,
    "Get your ass in there."
    
    67 F.3d at 346
    .        Applying the three factors enumerated in Graham,
    we reversed the district court's grant of summary judgment on the
    basis that the record compelled the conclusion that the force used
    was reasonable under the circumstances, holding that a reasonable
    jury could find that "the force with which [the first officer]
    effected the sudden, unannounced, violent seizure and removal of
    [the plaintiff]'s person" was unreasonable,                   "especially since
    there [was] no evidence or suggestion that she posed a risk of
    flight, attempted to resist or evade arrest, or threatened the
    peace, property or safety of anyone."             
    Id. at 353
    .
    One might look at our reasoning in Alexis and conclude,
    from our use of the word "force" in its singular form and the
    manner   in    which    we   adjudged   the    officers'      actions,    that   we
    considered them as one all-encompassing use of force.                    But looks
    can be deceiving.        In that same opinion, we noted that "all the
    - 17 -
    surrounding   circumstances,    individually     and     in   combination,
    plainly counseled minimal force in effecting any arrest," and we
    strongly implied that such minimal force was not used at any step
    of the way toward effecting the seizure, when Alexis "was abruptly
    pulled from the booth, and across the table, with sufficient force
    to bruise her legs, then handcuffed with her hands behind her back
    and dragged and carried to a police cruiser and pushed inside."
    
    Id.
       Thus, as the district court astutely observed and as Lachance
    has conceded, our decision in Alexis is at least as consistent
    with a segmented approach as it is with a holistic one, in that
    each use of force was arguably unreasonable.
    We have found no circuit that is completely averse to
    applying a segmented approach where it makes sense.            See, e.g.,
    Wright v. City of Euclid, 
    962 F.3d 852
    , 865 (6th Cir. 2020)
    ("[W]hen . . . a plaintiff claims that excessive force was used
    multiple times, 'the court must segment the incident into its
    constituent   parts   and   consider   the   officer's    entitlement   to
    qualified immunity at each step along the way.'") (quoting Smith
    v. City of Troy, 
    874 F.3d 938
    , 944 (6th Cir. 2017) (per curiam));
    Estate of Smart by Smart v. City of Wichita, 
    951 F.3d 1161
    , 1172-
    74, 1175-77 (10th Cir. 2020) (finding no clearly established law
    that shooting the decedent while he fled was unreasonable, but
    finding such law with respect to subsequently shooting him on the
    ground); Jackson v. Stair, 
    944 F.3d 704
    , 712, 714 (8th Cir. 2019)
    - 18 -
    (holding that the district court erred by ruling that the officer's
    conduct "as a whole" was reasonable without considering whether
    each of the three tasings "could be a constitutional violation on
    its own") (citing Blazek v. City of Iowa City, 
    761 F.3d 920
    , 925
    (8th Cir. 2014)); Harris v. Pittman, 
    927 F.3d 266
    , 268-69 (4th
    Cir. 2019) ("[E]ven where an initial use of deadly force is
    reasonable, the repeated use of force may be constitutionally
    excessive if circumstances change in a material way.") (citing
    Waterman v. Batton, 
    393 F.3d 471
    , 481 (4th Cir. 2005)), cert.
    denied, 
    140 S. Ct. 1550
     (2020); Horton v. Pobjecky, 
    883 F.3d 941
    ,
    950 (7th Cir. 2018) ("Even though an officer may in one moment
    confront circumstances in which he could constitutionally use
    deadly     force,   that   does   not   necessarily   mean   he   may   still
    constitutionally use deadly force the next moment.") (citing Ellis
    v. Wynalda, 
    999 F.2d 243
    , 247 (7th Cir. 1993)); Mills v. Fenger,
    
    216 F. App'x 7
    , 8-10 (2d Cir. 2006) (considering plaintiff's claim
    that "officers used excessive force at three separate points during
    his arrest," id. at 8, and holding that there were fact issues
    whether the first and second uses were reasonable, but not so the
    third).9
    9 There are some cases in the Fourth Circuit that might appear
    to reject segmentation. See, e.g., Livingston v. Kehagias, 
    803 F. App'x 673
    , 686 (4th Cir. 2020) (rejecting the defendant officers'
    "element by element or moment by moment" view of the facts for
    purposes of qualified immunity and instead considering whether
    "the force used as a whole," or "the cumulative force deployed,"
    - 19 -
    It seems to us that the segmented approach is also
    consistent with Supreme Court precedent.            In Graham, the Court
    made clear that the reasonableness of a use of force is to be
    determined "at the moment" that the force was applied.           
    490 U.S. at 396
    .   It explicated that the reasonableness inquiry depends on
    "the   facts   and   circumstances   confronting"    the   officer   in   "a
    was reasonable) (citing Rowland v. Perry, 
    41 F.3d 167
    , 173 (4th
    Cir. 1994)); Yates v. Terry, 
    817 F.3d 877
    , 883 (4th Cir. 2016)
    (faulting the district court's individualized consideration of
    three tasings of the plaintiff and adding that it had "cautioned
    courts against using 'a segmented view of the sequence of events'
    where 'each distinct act of force becomes reasonable given what
    [the officer] knew at each point in th[e] progression'"
    (alterations in original) (quoting Rowland, 
    41 F.3d at 173
    )). But
    each of these cases hinged on Rowland for their rejection of the
    segmented approach, and that case rejected not "the notion that
    the reasonableness of force employed can turn on a change of
    circumstances during an encounter lasting only a few seconds," but
    rather "the idea that any of the events should be reviewed outside
    the context of the conduct that precipitated the seizure."
    Waterman, 
    393 F.3d at 481
    ; see also Smith v. Ray, 
    781 F.3d 95
    , 102
    n.4 (4th Cir. 2015) (noting that Waterman "explained" where
    segmentation is appropriate and where it is not).
    Thus, those few Fourth Circuit cases that have declined
    to apply segmentation were typically such that whether segmented
    or not, each use of force was arguably unreasonable because the
    Graham factors remained relatively constant throughout the
    encounter and weighed heavily against the officer(s). See, e.g.,
    Livingston, 803 F. App'x at 684 (noting that "the officers were
    faced with an individual who had committed, at most, minor
    offenses; did not attempt to attack the officers; was not and did
    not appear to be armed; and offered no resistance until after he
    was suddenly brought to the ground, and only passive resistance
    after that"); Yates, 817 F.3d at 885-86 (noting that the plaintiff
    at most committed "minor traffic infractions," was not a danger to
    the officer "at any time during their encounter," and "was not
    attempting to flee or resist"). In many ways, then, these cases
    resemble our decision in Alexis.
    - 20 -
    particular situation," which facts and circumstances are "often
    . . . tense, uncertain, and rapidly evolving."       Id. at 397.   Put
    differently, "[e]xcessive force claims . . . are evaluated for
    objective reasonableness based upon the information the officers
    had when the conduct occurred."     Cnty. of Los Angeles v. Mendez,
    
    137 S. Ct. 1539
    , 1546-47 (2017) (omission in original) (quoting
    Saucier v. Katz, 
    533 U.S. 194
    , 207 (2001)).      Such language seems
    to favor a segmented approach, at least when circumstances relevant
    to the reasonableness inquiry changed between one use of force and
    another.10   After all, if the reasonableness of an officer's use
    of force depends on the information available to that officer under
    a   particular   set   of   circumstances,   which   appear   to   have
    10This does not mean that a segmented approach could not be
    deployed even if all relevant circumstances are held constant
    throughout.   It would simply be a waste of ink and time.    For
    example, if an officer reasonably would have believed that a
    suspect was completely incapacitated and yet proceeded to beat,
    then tase, then shoot him anyway, then a court need not proceed
    seriatim through each of the three uses of force and explain why
    they were unreasonable and why such was clearly established; the
    uses of force were individually and collectively unlawful. This
    is consistent with our approach in Alexis and with the Fourth
    Circuit's cases discussed supra note 9.
    Nor does this mean that after segmenting the uses of force
    and assessing each as reasonable, a court could not thereafter
    look at the totality of the uses of force, see Graham, 
    490 U.S. at 396
    ; Alexis, 
    67 F.3d at 353
     (looking at "combination" of segments),
    and determine that there was a constitutional violation, see, e.g.,
    Yates, 817 F.3d at 883.
    - 21 -
    meaningfully changed between one use of force and another, then it
    only makes sense to consider those uses separately.11
    Here,   there     was    clearly   a   change   in   circumstances
    between   the   push   and    the    kneel    that   was   relevant   to   the
    reasonableness inquiry.            Before the push, Lachance was still
    standing and actively attempting to make his way outside, and he
    had been resisting the officers' efforts to stop him by issuing
    instructions, grabbing his arms, and redirecting him.              After the
    push, Lachance was on the floor with visible bruising on his back
    and, although he was flailing his arms and legs, may have been
    attempting simply to stand up (as opposed to going outside) when
    an officer kneeled on his back to keep him down.             On these facts,
    it made sense for the district court to segment its analysis.
    11This does not mean that the officers' actions or inactions
    leading up to the moment in question cannot be considered, and in
    fact they should be considered as part of the "totality of the
    circumstances" in determining reasonableness. See Young v. City
    of Providence ex rel. Napolitano, 
    404 F.3d 4
    , 22 (1st Cir. 2005)
    (quoting Tennessee v. Garner, 
    471 U.S. 1
    , 8–9 (1985)); but see
    Mendez, 
    137 S. Ct. at
    1547 n.* (declining to consider whether as
    part of the "totality of the circumstances" inquiry it is
    appropriate to account for "unreasonable police conduct prior to
    the use of force that foreseeably created the need to use it"
    (quoting Graham, 
    490 U.S. at 396
    )).      Nor does it mean that a
    plaintiff could not recover for injury immediately caused by a
    reasonable use of force, which in turn was proximately caused by
    events set in motion by a prior unreasonable use of force. Cf.
    Mendez, 
    137 S. Ct. at 1548
    . These considerations do not factor in
    here, however, because Lachance is effectively arguing that a
    subsequent use of force -- the kneel -- should retroactively taint
    a prior use of force -- the push.
    - 22 -
    Lachance himself conceded at oral argument that there
    are times when a segmented approach makes the most sense, and he
    conceded in his opening brief that the push and the kneel were two
    distinct "uses of force" and that our rulings in Jennings and
    Alexis are consistent with a segmented approach.            His only real
    arguments against a segmented approach are that the push and the
    kneel occurred during the course of a "single transaction occurring
    in a brief period" and that we did not use the word "segmented" in
    Jennings   and   Alexis.     Lachance    otherwise     summarizes    without
    exegesis the Sixth Circuit's ruling in Rush and conclusorily
    asserts that "neither the fact pattern, First Circuit case law,
    cases cited by the District Court, nor the interests of justice
    required the District Court to apply the fractured or segmented
    qualified immunity analysis that it did."            If there were grounds
    to find error with the district court's segmented approach, we
    have found none and Lachance has not pointed to any.
    2.
    Proceeding   to   analyze    the   push   separately     from   the
    kneel, we conclude that the push was not a clearly established
    violation of Lachance's right to be free of unreasonable seizures.
    Lachance argues that the Graham factors are lopsided in his favor
    and that this is sufficient to show that his right was clearly
    established.     But it is well-established that the Graham factors,
    while instructive, are not exhaustive of the totality of the
    - 23 -
    circumstances that must be considered in each excessive force case.
    See Kingsley v. Hendrickson, 
    576 U.S. 389
    , 397 (2015).               Moreover,
    the Graham test is geared toward criminal suspects as opposed to
    persons who are suspected only of experiencing a medical emergency
    for which they require aid.        See Estate of Hill by Hill v. Miracle,
    
    853 F.3d 306
    , 313 (6th Cir. 2017).          Still, we briefly consider how
    the Graham factors apply to the facts of this case.
    Here, it was undisputed that Lachance was struggling to
    walk; that he seemed intent on making his way outside the kitchen
    door of his second-story apartment, where a steep, icy staircase
    awaited him; and that the officers' actions were geared toward
    preventing him from doing so.         On these facts, we cannot say that
    Graham was instructive enough on its own to have provided "fair
    warning" to the defendant officers in this case that the push was
    unreasonable.     Hope, 
    536 U.S. at 741
    ; see also Graham, 
    490 U.S. at 396
       ("Not    every   push   or   shove,    even   if   it   may   later   seem
    unnecessary in the peace of a judge's chambers, violates the Fourth
    Amendment." (internal quotation marks and citation omitted)).
    Certainly, this was not an "obvious case" where the officers so
    blatantly violated the Fourth Amendment that recourse to factually
    analogous case law is unnecessary.             Wesby, 138 S. Ct. at 590
    (quoting Brosseau, 
    543 U.S. at 199
    ).
    To that end, Lachance cites a number of purportedly
    factually analogous cases, but none are materially similar enough
    - 24 -
    to have provided reasonable officers under the circumstances with
    fair warning that they would violate Lachance's rights by pushing
    him in the manner that the defendant officers did.            He cites as
    controlling authority our decision in Ciolino, 
    861 F.3d 296
    , but
    that decision could not have clearly established his right as of
    the date of the push in January 2014.        See Kisela, 
    138 S. Ct. at 1154
     ("[A] reasonable officer is not required to foresee judicial
    decisions that do not yet exist in instances where the requirements
    of the Fourth Amendment are far from obvious.").          The same is true
    of most of the decisions that Lachance relies on.          See Smith, 
    874 F.3d 938
    ; Taylor v. Moore, 
    383 F. Supp. 3d 91
     (D. Mass. 2019);
    Guthrie v. Guthrie, 
    216 F. Supp. 3d 590
     (W.D. Pa. 2016); Barcomb
    v. Kraeger, 
    2016 WL 2644885
     (D. Conn. May 5, 2016); Lynn v. City
    of Indianapolis, 
    2014 WL 3535554
     (S.D. Ind.              July 16,    2014).
    Although a plaintiff may rely on cases published after the date of
    his   incident   where   the   cases   reiterate   or   summarize   clearly
    established law at the time of the plaintiff's incident, see
    Brosseau, 
    543 U.S. at 200
     (assessing whether "at the time of
    [defendant's] actions," there was clearly established law), none
    of these cases Lachance cites address clearly established law in
    January 2014 related to the push.
    Lachance cites just four decisions that predate the
    police officers' conduct in this case: Raiche v. Pietroski, 
    623 F.3d 30
     (1st Cir. 2010); Morelli v. Webster, 
    552 F.3d 12
     (1st Cir.
    - 25 -
    2009); Alexis, 
    67 F.3d 341
    ; and Fera v. City of Albany, 
    568 F. Supp. 2d 248
     (N.D.N.Y. 2008).        We briefly summarize the facts of
    each case, which were depicted in the light most favorable to the
    plaintiffs.    Raiche was driving a motorcycle without a helmet, so
    two   police   officers   signaled   him     to   pull   over;   he    did   not
    immediately stop; and when he did, one of the officers immediately
    ran over and tackled him, causing his head to hit the pavement and
    the motorcycle to fall on his leg. 
    623 F.3d at 33-34
    . In affirming
    the denial of qualified immunity to the officer, we noted that
    Raiche displayed no inclination to resist or flee, 
    id. at 37
    , and
    "present[ed]    no   indications     of     dangerousness,"      
    id. at 39
    .
    Similarly, Morelli was suspected only of the theft of $20 and had
    shown no "evidence of either dangerousness or attempted flight"
    when a police officer yanked her arm and pinned her against a wall
    for three to four minutes with sufficient force to tear her rotator
    cuff.   
    552 F.3d at 24
    .   We therefore upheld the denial of qualified
    immunity to the officer.     
    Id. at 25
    .
    We have already discussed in detail Alexis's experience,
    but we recount that she was suspected only of criminal trespass,
    did not "pose[] a threat to . . . anyone," and never "attempted to
    evade or resist arrest."     
    67 F.3d at 353
    .        Finally, Fera suffered
    a seizure in a government building, and officers arrested her when
    she refused orders to leave; the officers ignored numerous signs
    that she was epileptic and her express warning that she was about
    - 26 -
    to suffer another seizure; they placed her in the back of a police
    van alone and handcuffed, where a seizure immobilized her; and
    then they pulled her unresponsive body from the van by the ankles
    in such a way that her face repeatedly bounced off its floor.          
    568 F. Supp. 2d at 251-52
    .    On those facts, the District Court for the
    Northern District of New York denied qualified immunity.           
    Id. at 253-57
    .
    All four cases are readily distinguishable from the
    instant one.    Most notably, in each of those cases, the plaintiff
    did not pose a discernable risk to anyone.        Here, Lachance posed
    a risk of serious physical harm to himself were he permitted to
    stumble outside to a steep, icy stairway.         Moreover, whereas in
    those cases the plaintiffs at no point resisted the officers, here
    Lachance clearly did by continuing toward the door even after they
    grabbed his arms and repeatedly told him to stop walking.              Cf.
    Gray, 917 F.3d at 12 (finding prior case "inapposite" for purposes
    of   clearly   established   inquiry   because   there,   the    plaintiff
    "present[ed]    no   significant    'active   resistance'   or     threat"
    (alteration in original) (quoting Parker, 547 F.3d at 10)).12
    Because of these material differences with all four cases,
    12
    we need not address whether Fera, an out-of-circuit district court
    decision, could have put a reasonable officer in Massachusetts on
    notice of its holding. See Camreta v. Greene, 
    563 U.S. 692
    , 709
    n.7 (2011) ("[D]istrict court decisions -- unlike those from the
    courts of appeals -- do not necessarily settle constitutional
    standards or prevent repeated claims of qualified immunity," and
    therefore "[m]any Courts of Appeals . . . decline to consider
    - 27 -
    Therefore, Lachance has failed to meet his burden of showing that
    the defendants violated his clearly established rights.
    Accordingly, we affirm the district court's grant of
    summary judgment in favor of the defendants as to the push.
    B.
    We review de novo a district court's grant of a Rule
    50(a) motion for judgment as a matter of law.                  See Hernandez-
    Cuevas v. Taylor, 
    836 F.3d 116
    , 124 (1st Cir. 2016).                  We must
    affirm if, after taking the evidence in the light most favorable
    to the nonmovant, "a reasonable jury would not have a legally
    sufficient evidentiary basis to find for the party on that issue."
    
    Id.
     (quoting Fed. R. Civ. P. 50(a)(1)).
    1.
    Both parties accept the principle that in order to
    recover on a Fourth Amendment excessive force claim under § 1983,
    a   plaintiff   must   show   that    he    suffered   damages   caused    by   a
    defendant's use of such force.             Cf. Mendez, 
    137 S. Ct. at
    1548
    (citing Heck v. Humphrey, 
    512 U.S. 477
    , 483 (1994); Memphis Cmty.
    Sch. Dist. v. Stachura, 
    477 U.S. 299
    , 306 (1986)); see also
    Drumgold v. Callahan, 
    707 F.3d 28
    , 48 (1st Cir. 2013) ("As a
    general   rule,   '[w]e   employ     common     law    tort   principles   when
    conducting inquiries into causation under § 1983.'" (alteration in
    district court precedent when determining if constitutional rights
    are clearly established for purposes of qualified immunity.").
    - 28 -
    original) (quoting Sanchez v. Pereira–Castillo, 
    590 F.3d 31
    , 50
    (1st Cir. 2009))).      That showing must be made by a preponderance
    of the evidence.     See Vélez-Rivera v. Agosto-Alicea, 
    437 F.3d 145
    ,
    151 (1st Cir. 2006).
    The district court granted the defendants' motion for
    judgment   as   a   matter   of   law   on   what   remained   of   Lachance's
    excessive force claim on grounds that he was only permitted to
    proceed to trial on claims relating to injuries caused by the
    kneel, that he failed to present any evidence that any injury that
    he suffered was caused by the kneel as opposed to the push, and
    that therefore no reasonable jury could find in his favor.
    Lachance argues that the district court erred in finding
    that there was insufficient evidence of a causal link between the
    kneel and any of his injuries.13 The defendants defend the district
    court's ruling that the evidence failed to show that any of
    Lachance's injuries were caused the kneel.
    13 Lachance also suggests an alternative argument that he
    could   otherwise  have   been   entitled   to   nominal   damages.
    Specifically, he quotes from the district court's summary judgment
    opinion that "even if [Lachance] cannot prove an injury, he may be
    entitled to nominal damages if he can demonstrate that he was
    deprived of a constitutional right" (citing Stachura, 
    477 U.S. at
    308 n.11 ("[N]ominal damages, and not damages based on some
    undefinable 'value' of infringed rights, are the appropriate means
    of 'vindicating' rights whose deprivation has not caused actual,
    provable injury.")).    But he goes no further than this scant
    reference and has therefore waived the argument. See Zannino, 
    895 F.2d at 17
    . We add that the issue here was with respect to evidence
    of causation, not of injury.
    - 29 -
    We conclude that there is just enough evidence from which
    a reasonable jury could have found it was more likely than not
    that the kneel caused Lachance some injury additional to the
    compression fracture.   Certainly, much of the evidence in this
    regard was weak.   For example, Dr. Chirkov opined that the kneel
    could have caused Lachance more pain, but there is little in the
    trial record to show that Lachance actually suffered any pain from
    the kneel as distinct from the fracture.       Lachance could not
    remember the incident, and although he testified that he woke up
    in the hospital with pain in the center of his back, he also
    testified that the pain he felt at the time of the trial was in
    the same part of his "middle back where it was broke."
    Dr. Chirkov also testified that a bruise on Lachance's
    midline was "consistent with" a compression mark typically seen on
    a person who was restrained, but it is not clear from the trial
    record why the bruise was any less consistent with a bruise that
    a reasonable jury would know could have resulted from the hard
    shove onto the recliner that broke Lachance's back, his subsequent
    fall to the hard floor on his back with an officer landing on top
    of him, or his being dragged across that floor on his back --
    evidence of which was also presented at the trial.     That is not
    enough to prove causation in this case.   Cf. Norwood v. Ghosh, 
    723 F. App'x 357
    , 366 (7th Cir. 2018) (finding in the Eighth Amendment
    context that expert testimony that delays in treatment "could have"
    - 30 -
    resulted in the plaintiff's condition "falls short of verifying
    medical evidence that would allow a reasonable jury to find by a
    preponderance   of   the   evidence   that   such   causation   actually
    occurred"), as amended (Feb. 16, 2018).
    Still, Dr. Chirkov also opined to a reasonable degree of
    medical certainty, which is consistent with the preponderance of
    the evidence standard, see O'Brien, 943 F.3d at 522 n.4, that two
    bruises on Lachance's upper back were "caused" by "pressure on his
    back, physical compression" of the sort "usually . . . see[n] . . .
    on restrained people."14    A reasonable jury could have attributed
    great weight to this unrebutted expert testimony and found that
    the bruises were caused by restraining as opposed to the push.        Of
    course, Lachance experienced numerous forms of restraint apart
    from the kneel, including the police officers holding onto his
    arms, dragging him by the wrists, flipping him over, pulling his
    arms back to place him in handcuffs, and locking his legs.           But
    the only restraint recounted at trial that linked at all to
    Lachance's back was the kneel.    Therefore, a reasonable jury could
    have found that it was more likely than not that at least some of
    the bruising on Lachance's upper back was caused by the kneel.
    14The defendants moved to strike this portion of Dr. Chirkov's
    testimony, among others, on grounds that it was not part of his
    Federal Rule of Civil Procedure 26 disclosure and inconsistent
    with his deposition testimony. The court did not grant the motion;
    rather, it permitted the defendants to cross-examine Dr. Chirkov
    again, which they did.
    - 31 -
    That Dr. Chirkov testified that any injuries apart from
    the compression fracture were insignificant is of no matter.                   What
    is significant injury from a clinical perspective is something
    entirely different from what is sufficient to support a finding of
    liability on a Fourth Amendment excessive force claim. See Wilkins
    v. Gaddy, 
    559 U.S. 34
    , 37 (2010) (noting in the Eighth Amendment
    context that the Court has "rejected the notion that 'significant
    injury' is a threshold requirement for stating an excessive force
    claim");    Alexis,   
    67 F.3d at
        353    n.11   (noting   in    the   Fourth
    Amendment context that minor injuries can support an excessive
    force claim and citing bruises as an example of such injuries).
    2.
    Unlike public officials, municipalities do not enjoy
    qualified immunity, so the fact that officers may be entitled to
    such immunity for some action does not automatically absolve their
    municipal employer from being liable for that same action.                      See
    Davis v. United States, 
    564 U.S. 229
    , 248 n.9 (2011); Walden v.
    City   of   Providence,    
    596 F.3d 38
    ,    55    n.23   (1st    Cir.   2010).
    Moreover, we have observed that "Massachusetts law is unsettled
    regarding the existence of a state-law concept analogous to federal
    qualified immunity."       Raiche, 
    623 F.3d at
    40 (citing Foster v.
    McGrail, 
    844 F. Supp. 16
    , 29 (D. Mass. 1994)).                We have found, and
    the parties have given us, no reason to disturb that observation.
    - 32 -
    Notwithstanding     this       precedent,   the   district   court
    granted the defendants' motion for judgment as a matter of law on
    Lachance's    remaining   counts    --    the   Monell   claim,   which   the
    defendants did not seek judgment on, as well as the assault and
    battery and negligence claims -- for the same reason that it
    granted the motion as to his excessive force claim, that is, his
    failure to produce sufficient evidence that the kneel caused him
    any injury.
    Lachance argues that the district court erred because he
    was in fact subjected to constitutionally excessive force and
    because even if no injury was caused by the kneel, he could have
    recovered on his state law claims for injuries caused by the push
    notwithstanding the court's summary judgment ruling because the
    defendants failed to raise         as a defense       a Massachusetts law
    analogue to federal qualified immunity.           These arguments are not
    new; Lachance raised them before the district court, and they were
    largely the basis for the court's denial of summary judgment on
    those counts.
    The defendants respond that the assault and battery and
    negligence claims fail because there was no evidence that the
    officers intentionally used unjustified force or acted negligently
    and because assault and battery claims "rise and fall" with § 1983
    claims, and that the Monell claim fails because there was no
    underlying constitutional violation.
    - 33 -
    The district court's order was based on the premise that,
    because the defendant officers enjoyed federal qualified immunity
    on the excessive force claim as to the push, the town could not be
    liable under Monell and the individual officers could not be liable
    under state tort law for injuries that might have resulted from
    the push.     This was error.
    For example, the defendants cite Gray, 
    917 F.3d 1
    , for
    the proposition that "assault and battery . . . claims 'rise and
    fall with . . . [her] § 1983 claim.'"          Id. at 14 (alteration in
    original).     They did the same in their motion before the district
    court.   In Gray, we merely restated a "concession" offered by the
    plaintiff in her briefing, which we accepted for purposes of that
    case only.    Id.    We have in the past held that "[w]here a plaintiff
    alleges both a § 1983 excessive force claim and common law claims
    for assault and battery, our determination of the reasonableness
    of the force used under § 1983 controls our determination of the
    reasonableness of the force used under the common law assault and
    battery claims."      Raiche, 
    623 F.3d at 40
    .    That rule is inapposite
    here where the district court did not assess the reasonableness of
    the officers' actions in granting the defendants' motion.
    Similarly, it is true that "Monell can impose municipal
    liability     only     for underlying,     identifiable   constitutional
    violations . . . ."       Kennedy v. Town of Billerica, 
    617 F.3d 520
    ,
    531 (1st Cir. 2010).       But the district court ruled only that no
    - 34 -
    reasonable jury could find a constitutional violation as to the
    kneel due to the lack of evidence of causation; it did not rule at
    summary judgment or after the trial that no reasonable jury could
    find that the push was not a constitutional violation.
    The defendants      offer numerous alternative bases for
    affirmance.   We decline to exercise our discretion to affirm on
    any of those bases, finding it "appropriate to leave such a matter
    for the district court to address in the first instance on remand,
    especially when the grounds are not fully developed or fairly
    contested on appeal," as is the case here.        Yan v. ReWalk Robotics
    Ltd., 
    973 F.3d 22
    , 39 (1st Cir. 2020).
    Accordingly,   we    vacate    the   district   court's   order
    granting the defendants' motion for judgment as a matter of law.
    III.
    For the foregoing reasons, we affirm in part and vacate
    in part.   We vacate and remand the district court's order granting
    the defendants' motion for judgment as a matter of law for further
    proceedings consistent with this opinion. Costs to appellant.
    - 35 -