Kiribati Seafood Co., LLC v. Dechert LLP ( 2017 )


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    SJC-12287
    KIRIBATI SEAFOOD COMPANY, LLC, & another1    vs.   DECHERT LLP.
    Suffolk.    April 6, 2017. - October 11, 2017.
    Present:     Gants, C.J., Lenk, Hines, Gaziano, Lowy, Budd,
    & Cypher, JJ.2
    Attorney at Law, Malpractice, Negligence. Negligence, Attorney
    at law, Proximate cause. Proximate Cause. Damages,
    Mitigation.
    Civil action commenced in the Superior Court Department on
    July 1, 2013.
    The case was heard by Kenneth W. Salinger, J., on motions
    for summary judgment.
    The Supreme Judicial Court on its own initiative
    transferred the case from the Appeals Court.
    Megan C. Deluhery (John R. Neeleman, of Washington, also
    present) for Kiribati Seafood Company, LLC.
    Denis M. King (Richard M. Zielinski also present) for the
    defendant.
    1
    Olympic Packer, LLC.
    2
    Justice Hines participated in the deliberation on this
    case prior to her retirement.
    2
    GANTS, C.J.   The issue on appeal is whether, in a legal
    malpractice action, a court's error of law constitutes a
    superseding cause that bars recovery to the plaintiff client
    even where the defendant attorney was negligent for failing to
    prevent or mitigate the legal error.    The plaintiff, Kiribati
    Seafood Company, LLC (Kiribati), brought a legal malpractice
    claim against its former law firm, Dechert LLP (Dechert).
    Kiribati alleged that Dechert negligently failed to provide a
    French appellate court with the evidence the court deemed
    necessary for Kiribati to prevail on a claim, which resulted in
    the court's denial of the claim.   A judge of the Superior Court
    granted summary judgment to Dechert and denied partial summary
    judgment to Kiribati.   The judge determined that the French
    appellate court committed an error of law in requiring this
    evidence and that, even if Dechert were negligent in failing to
    provide the evidence to the court, Kiribati could not recover
    damages for Dechert's negligence because the court's legal error
    was a superseding cause of the adverse decision.    We conclude
    that an error of law under these circumstances is a concurrent,
    not a superseding, proximate cause and that the judge therefore
    erred in granting summary judgment to Dechert and denying
    partial summary judgment to Kiribati.
    Background.   Because this is an appeal from an allowance of
    summary judgment, we set forth the undisputed material facts.
    3
    Kiribati purchased a fishing vessel known as the Madee (ship),
    and chartered it to Olympic Packer, LLC, and Dojin Co., Ltd.,
    for the purpose of fishing for tuna in the Pacific Ocean.3    After
    sustaining damage to its rudder, the ship was placed in a dry
    dock in the Autonomous Port of Papeete (port) in Tahiti to
    undergo repairs.   When the dry dock collapsed, the ship
    sustained damages so severe that it was deemed a "constructive
    total loss" by Kiribati's "port risk" insurer, Certain
    Underwriters of Lloyd's of London (Lloyd's).   Kiribati retained
    two attorneys in the Paris office of the law firm Coudert
    Brothers LLP (Coudert) to file a lawsuit for damages against the
    port in the Commercial Court of Papeete (commercial court).
    When these two attorneys left Coudert to join Dechert, Kiribati
    continued to retain them and transferred the representation to
    Dechert.
    Lloyd's paid Kiribati $1,763,803.71 on its insurance claim
    regarding the loss of the ship, which compensated Kiribati for
    some, but not all, of its losses.   As a result of its payment,
    Lloyd's had a right of subrogation to recover that amount from
    the port.   In April, 2004, Lloyd's and Kiribati entered into a
    written agreement jointly to prosecute Kiribati's litigation in
    3
    Kiribati Seafood Company, LLC, and Olympic Packer, LLC,
    are limited liability companies organized in the State of
    Washington. Dechert LLP is a law firm organized as a limited
    liability partnership that is registered in Pennsylvania but has
    offices around the world, including in Boston.
    4
    the commercial court, where Kiribati sought to recover its
    losses that were not compensated by Lloyd's, and where Lloyd's
    sought to recover through subrogation the amount it paid to
    Kiribati.   As part of the agreement, Lloyd's agreed to pay half
    of the attorney's fees and costs associated with this
    litigation.
    The agreement between Kiribati and Lloyd's jointly to
    prosecute the suit against the port did not end Kiribati's
    financial disputes with Lloyd's.   Kiribati contended that it was
    paying substantially more than its fifty per cent share of the
    legal fees in the litigation and that Lloyd's was failing to pay
    its equal share.   Kiribati also claimed that Lloyd's had failed
    to pay it in full for the "sue and labor" and mitigation
    expenses it was entitled to under its policy.   To settle these
    and other disputes, in December, 2004, Kiribati and Lloyd's
    entered into a new agreement in which Kiribati released Lloyd's
    from all outstanding claims, including its claims for unpaid
    attorney's fees and "sue and labor" and mitigation expenses.      In
    return, Lloyd's assigned its subrogation claim to Kiribati.
    In January, 2008, the commercial court issued a judgment in
    favor of Kiribati and against the port.   As part of the
    judgment, the court found that the assignment of the subrogation
    claim was "signed abroad" by "two foreign registered entities"
    without any specific agreement that French law would apply, so
    5
    the validity of the assignment could not be determined under
    French law.   The court concluded that it was "valid" under
    "foreign law," and therefore awarded Kiribati the full amount of
    the subrogation claim assigned to it by Lloyd's -- approximately
    $1.76 million.   The port appealed from the decision to the Court
    of Appeals of Papeete (court of appeals).
    Tahitian courts are part of the French legal system.      A
    judgment by the commercial court may be appealed from as of
    right to the court of appeals, which will review the decision de
    novo and consider new evidence offered by the parties to
    supplement the record.   A decision by the court of appeals is
    appealable from as of right to the Cour de cassation in Paris,
    which is the French Supreme Court, but that court will review
    decisions only for errors of law.
    In its first appellate decision, issued in April, 2010, the
    court of appeals affirmed much of the judgment of the commercial
    court, but it deferred decision regarding its enforcement of the
    assignment of the subrogation claim.   It did not challenge the
    validity of the assignment under foreign law but noted that the
    "enforceability" of the assignment in a French court of law
    against a French defendant must be determined according to
    French law, which forbids "double compensation of the same
    damages."   Where the port claimed that Kiribati was seeking "a
    double compensation for the damages and accordingly an unjust
    6
    enrichment," the court of appeals decided to defer any decision
    regarding this claim for compensation to allow Kiribati to prove
    the amount paid in consideration for the assignment by showing
    the "actual price of the transfer."
    After the first appellate decision, a Dechert attorney,
    Xavier Nyssen, advised Dennis Moran, an attorney in another law
    firm who was acting essentially as Kiribati's general counsel,
    that he needed evidence of the consideration paid by Kiribati
    for the assignment to address the court of appeals's concern
    about double compensation.   Moran on two separate occasions
    provided various documents to Dechert, including (1) a 2004
    letter from Moran to Lloyd's counsel demanding payment of
    Lloyd's equal share of Coudert's legal fees, with attached
    payment records that demonstrated that Kiribati had paid far
    more of the attorney's fees than did Lloyd's despite the
    provision in the settlement agreement that payment of the fees
    be shared equally; (2) the December, 2004, agreement between
    Kiribati and Lloyd's that included a release by Kiribati of all
    further claims on its Lloyd's policy; (3) correspondence
    identifying the various claims against Lloyd's that Kiribati had
    released; and (4) an unsworn written statement by a Lloyd's
    representative that declared that "[t]he subrogation rights were
    assigned for valuable consideration, the amount of which is
    privileged."
    7
    In support of its brief, Dechert submitted to the court of
    appeals as evidence only the 2004 letter from Moran, without any
    of the supporting documentation regarding legal fees, and the
    unsworn written statement by the Lloyd's representative, without
    the policyholder's release or the correspondence identifying the
    released claims.   After the port in its response noted that
    Kiribati had provided no proof of having paid attorney's fees
    that Lloyd's was obligated to pay, another Kiribati attorney
    (who was not associated with Dechert) caused Nyssen again to be
    sent the documents that Moran had earlier provided and informed
    Nyssen that he needed to submit the attorney's fee payment
    records and the policyholder release in order to demonstrate the
    payment of consideration for the assignment.   Dechert did not
    further supplement the record by providing these documents to
    the court of appeals.
    In May, 2011, the court of appeals in its final decision
    reduced the amount of Kiribati's award by the amount of the
    assigned subrogated claim because Kiribati had failed to meet
    its burden to provide evidence of the "financial compensation"
    it paid for the assignment, explaining that "double recovery for
    the same damage must be avoided."   The court specifically noted
    that Kiribati had failed to provide any evidence that it had
    paid attorney's fees that Lloyd's was obligated to pay, or that
    it had released Lloyd's from legal claims that Kiribati
    8
    otherwise could have brought in a court of law.
    In June, 2011, Kiribati was in receivership, so Nyssen sent
    an electronic mail message to its receiver informing him that
    the court of appeals decision could be challenged before the
    Cour de cassation, but only as to errors of law.   Nyssen wrote,
    "As for Kiribati's subrogation interest acquired from . . .
    Lloyd's, there may be grounds to call into question its
    decision, although we would need the opinion of a lawyer
    registered with the Cour de cassation to take [a] position."
    Nyssen wrote that he "would not recommend challenging the
    decision" because of the cost and duration of the appeal, which
    he estimated at one to two years, and because an appeal by
    Kiribati may cause the defendants to challenge the entirety of
    the court of appeals ruling, which might result in a suspension
    of its enforcement.   The receiver later filed in the
    receivership action a motion for authorization to waive an
    appeal in the Tahiti litigation, attaching to his declaration a
    letter from an attorney for Kiribati stating that "Kiribati's
    shareholders will follow Dechert's advice and not appeal the
    Tahiti litigation outcome."   The court approved the receiver's
    request for authorization to waive the appeal.
    In July, 2013, Kiribati commenced this action in the
    Superior Court of Massachusetts against Dechert, alleging, among
    other claims, that Dechert was professionally negligent in its
    9
    prosecution of the assigned subrogation claim because it failed
    to present evidence the court of appeals had requested and that
    Dechert had in its possession, resulting in a loss to Kiribati
    of approximately $1.76 million.4    Dechert moved for summary
    judgment as to all of the remaining claims; Kiribati cross-moved
    for partial summary judgment on its legal malpractice claim.
    In support of their motions, both parties submitted
    affidavits from their respective chosen experts on issues of
    French law.    Dechert moved to strike the affidavit submitted by
    Kiribati's expert, claiming that it failed to show that his
    education, training, and experience qualifies him to provide
    expert testimony on any aspect of French law.    The motion judge
    granted the motion, finding that Kiribati's expert had "never
    practiced as a lawyer in France . . . and [did] not identif[y]
    any other education, training, experience, or familiarity in or
    with the topics he addresses in his expert reports."    Kiribati
    did not challenge the qualifications of Dechert's expert, a
    practicing French lawyer, and the judge credited portions of the
    affidavit he submitted in support of Dechert's motion regarding
    the content of French law.
    In granting Dechert's motion for summary judgment, the
    judge noted that the content of foreign law is a question of law
    to be decided by the court.    He determined that the court of
    4
    None of Kiribati's other claims is at issue on appeal.
    10
    appeals had committed judicial error under French law in
    disallowing recovery of the $1.76 million assigned subrogation
    claim for lack of proof that it was not an impermissible double
    recovery.    The judge also determined that, regardless of whether
    Dechert was negligent in its handling of the appeal and
    regardless of whether the court's error of law was foreseeable,
    Dechert could not be found liable because the error of law by
    the court of appeals underlying the resulting adverse ruling was
    "a superseding cause that breaks the chain of causation flowing
    from [Dechert's alleged negligence]" and "that relieves Dechert
    of any negligence in its representation of Kiribati before that
    court."5    Kiribati appealed, and we transferred the case to this
    court on our own motion.
    Discussion.     Our review of a motion judge's decision on
    summary judgment is de novo, because we examine the same record
    and decide the same questions of law.    See Global NAPs, Inc. v.
    Awiszus, 
    457 Mass. 489
    , 499 n.16 (2010); Leavitt v. Mizner, 
    404 Mass. 81
    , 88 (1989); Mass. R. Civ. P. 56 (c), as amended, 
    436 Mass. 1404
    (2002).
    The central issue in this case is the relationship between
    5
    In a separate order, the judge granted Dechert's motion
    for costs as the prevailing party, and awarded $76,130.13 to
    compensate Dechert for the cost of obtaining deposition
    transcripts and "accurate English translations of key documents
    in [the] case" and for its attorney's travel to three
    depositions.
    11
    attorney malpractice and judicial error, more specifically, the
    circumstances under which an attorney should be relieved of
    liability for professional negligence where the attorney's
    negligent act or omission precedes judicial error.
    Attorneys who enter into attorney-client relationships owe
    their clients "an obligation to exercise a reasonable degree of
    care and skill in the performance of [their] legal duties."
    Global NAPs, 
    Inc., 457 Mass. at 500
    , quoting Pongonis v. Saab,
    
    396 Mass. 1005
    , 1005 (1985).    "To prevail on a claim of
    negligence by an attorney, a client must demonstrate that the
    attorney failed to exercise reasonable care and skill in
    handling the matter for which the attorney was retained . . . ;
    that the client has incurred a loss; and that the attorney's
    negligence is the proximate cause of the loss . . . ."      Global
    NAPs, 
    Inc., supra
    , quoting Colucci v. Rosen, Goldberg, Slavet,
    Levenson & Wekstein, P.C., 
    25 Mass. App. Ct. 107
    , 111 (1985).
    "Expert testimony is generally necessary to establish that an
    attorney failed to meet the standard of care owed in the
    particular circumstances."     Global NAPs, 
    Inc., supra
    , citing
    
    Pongonis, supra
    .   But "such testimony is not essential where
    'the claimed malpractice is so gross or obvious that laymen can
    rely on their common knowledge to recognize or infer
    negligence,' or where an attorney disobeys the lawful
    instructions of his client and a loss ensues for which the
    12
    attorney is responsible."    Global NAPs, 
    Inc., supra
    , quoting
    
    Pongonis, supra
    .
    As to the element of proximate cause, a client must
    demonstrate that it "probably would have obtained a better
    result had the attorney exercised adequate skill and care."
    Global NAPs, 
    Inc., 457 Mass. at 500
    , quoting Fishman v. Brooks,
    
    396 Mass. 643
    , 647 (1986).   Generally, the question of what the
    probable outcome would have been had the attorney acted
    reasonably is determined by a "trial within a trial," in which a
    new trier of fact decides both whether the attorney was
    negligent and what the outcome of the litigation would have been
    in the absence of negligence.   
    Fishman, supra
    .   The new trier of
    fact does not attempt subjectively to determine what the earlier
    trier of fact would have done; neither the judge nor the jurors
    at the earlier trial may testify at the new trial as to what
    they would have done under different circumstances.    See 
    id. (jury evaluate
    consequences of attorney negligence objectively).
    Rather, the new trier of fact makes an independent determination
    as to what reasonably would have been the outcome of the earlier
    trial in the absence of negligence, based on the applicable law
    and the evidence presented at the new trial.    See 4 R.E. Mallen,
    Legal Malpractice § 33:8, at 677 (2017 ed.), citing Cecala v.
    Newman, 
    532 F. Supp. 2d 1118
    , 1136 (D. Ariz. 2007) (trier of
    fact determines "what the result 'should have been'"); Justice
    13
    v. Carter, 
    972 F.2d 951
    , 956–957 (8th Cir. 1992); Phillips v.
    Clancy, 
    152 Ariz. 415
    , 418 (1986); Lombardo v. Huysentruyt, 
    91 Cal. App. 4th 656
    , 670-671 (2001); Harline v. Barker, 
    912 P.2d 433
    , 441 (Utah 1996).
    Proximate cause in an attorney malpractice case is more
    complicated where the defendant attorney contends that the
    adverse outcome was the product of the court's legal error.
    Judges, being human, sometimes err as to the law.
    "Theoretically, it is always foreseeable that a judge might err
    in some manner; however, it is not typically foreseeable on what
    issues a judge will err and on what issues a judge will rule
    correctly."   Stanfield v. Neubaum, 
    494 S.W.3d 90
    , 100 (Tex.
    2016).   Where an attorney makes a reasonable and correct
    argument of law and loses because of judicial error that was not
    foreseeable, the attorney cannot be found negligent for failing
    to prevent or mitigate that legal error.   See Correia v. Fagan,
    
    452 Mass. 120
    , 127 (2008) (liability for professional negligence
    dependent on showing loss was "reasonably foreseeable" [citation
    omitted]).
    But where the judicial error is foreseeable, such as where
    a judge or an appellate court has indicated an intention to rule
    in a manner that the attorney believes to be an error of law,
    then an attorney has an obligation to take reasonable and
    prudent steps to prevent or mitigate that error.    See Skinner v.
    14
    Stone, Raskin & Israel, 
    724 F.2d 264
    , 265-266 (2d Cir. 1983);
    
    Stanfield, 494 S.W.3d at 100
    .   Where the legal error will
    certainly doom the client's case, the attorney has few options
    but to provide additional argument or briefing in an attempt to
    demonstrate to the court the error of its foreseeable ruling of
    law.   But where the client can still prevail on the facts even
    if the court errs as to the law, the attorney is negligent where
    he or she fails to take reasonable steps to demonstrate to the
    court why the client still wins under the court's erroneous, but
    foreseeable, view of the law.   For instance, where a judge in a
    medical malpractice case has provided counsel with the
    instruction the judge intends to give to the jury regarding a
    physician's duty to obtain a patient's informed consent for a
    medical procedure, and where the physician's attorney fails to
    persuade the judge that the instruction is an error of law
    because it overstates a physician's duty, and where the
    physician has evidence in his or her possession that would prove
    that the physician complied with the duty erroneously described
    by the judge, the physician's attorney would be negligent if he
    or she failed to offer that evidence at trial.   Stated simply,
    where an attorney will foreseeably lose on the law but can still
    win on the facts, an attorney is negligent if he or she forgoes
    the opportunity to win on the facts.   See, e.g., 
    Skinner, supra
    (summary judgment for attorneys reversed in legal malpractice
    15
    action where attorneys knew of impending judicial error and
    failed to take preemptive steps); 
    Lombardo, 91 Cal. App. 4th at 667-668
    (client subjected to "unnecessary risk" where there was
    "abundant evidence" that attorney could have foreseen judicial
    error and failed to take "all reasonable steps" to mitigate
    impact); Temple Hoyne Buell Found. v. Holland & Hart, 
    851 P.2d 192
    , 198–199 (Colo. App. 1992) (obligation to anticipate
    "reasonably foreseeable risks" includes taking reasonably
    objective steps to avoid impact of foreseeable legal error).6
    To be clear, this does not suggest that an attorney has an
    obligation under the duty of reasonable care to argue an error
    of law.   But where a court has indicated that it has a different
    view of the law from that of the attorney, and where the client
    can prevail on the facts even under that different view, an
    attorney is negligent if he or she forfeits that opportunity by
    failing to argue in the alternative.
    Dechert contends that, where a court rules against a client
    based on a foreseeable error of law, the client's attorney
    6
    The adage penned by Carl Sandburg, attributed to "a
    battered barrister," comes to mind: "If the law is against you,
    talk about the evidence . . . . If the evidence is against you,
    talk about the law . . . . [A]nd . . . if the law and the
    evidence are both against you, then pound on the table and yell
    like hell." C. Sandburg, The People, Yes, in The Complete Poems
    of Carl Sandburg 551 (1969). We discourage attorneys from
    following the advice in the third sentence, but an attorney may
    be negligent if he or she fails to follow the advice in the
    first two sentences.
    16
    cannot be liable for failing to take reasonable steps to prevent
    or mitigate the consequences of that error by offering evidence
    that would enable the client to prevail even under the court's
    erroneous view of the law, because in such circumstances a
    court's legal error will always be the proximate cause of the
    adverse judicial decision.   It claims that, in the trial within
    a trial that occurs in a legal malpractice case, the new trier
    of fact must apply the correct law, and the judge's error of
    law, not the attorney's negligence, will always be revealed as
    the proximate cause of the adverse result.   In the context of
    this case, Dechert argues that a new, reasonable trier of fact,
    correctly applying French law, must conclude that Kiribati
    should have prevailed without proof of the consideration paid
    for the assignment, and therefore any negligence in failing to
    provide that proof cannot be the proximate cause of the lost
    $1.76 million.
    The fundamental flaw in this argument is that a plaintiff's
    loss need not have only one proximate cause; there can be
    multiple concurrent proximate causes.   See, e.g., Mullins v.
    Pine Manor College, 
    389 Mass. 47
    , 58, 62-63 (1983) (injury to
    rape victim caused both by assailant and by college's negligent
    security); 
    Skinner, 724 F.2d at 266
    ("there [can be] several
    proximate or efficient causes of an injury"); 
    Stanfield, 494 S.W.3d at 97
    (same).   See also Matsuyama v. Birnbaum, 
    452 Mass. 17
    1, 30 (2008) ("'substantial contributing factor' test is useful
    in cases in which damage has multiple causes").     Assuming for
    the sake of argument that the court of appeals truly made an
    error of law, a reasonable finder of fact would conclude that
    there were two independent proximate causes of Kiribati's loss:
    Dechert's negligence in failing to furnish the court with proof
    of the consideration paid for the assignment, and the court's
    error of law in concluding that the assigned subrogation claim
    was not enforceable under French law absent a demonstration that
    it would not result in "double compensation."
    Nor is this flaw cured in the circumstances of this case
    by characterizing the judicial error as the superseding cause.
    A superseding cause in legal malpractice "(1) must have occurred
    after the original negligence; (2) cannot [be] the consequence
    of the attorney's negligence; (3) created a result that would
    not otherwise have followed from the original negligence; and
    (4) was not reasonably foreseeable."     1 R.E. Mallen, Legal
    Malpractice § 8:25, at 1049 (2017 ed.).    Where the intervening
    cause meets all four criteria, the intervening cause is a new
    and independent cause that breaks the chain of causation,
    becoming a superseding cause that relieves the defendant of
    liability for the original negligence.    See Kent v.
    Commonwealth, 
    437 Mass. 312
    , 321 (2002) (intervening event that
    is "superseding cause of the harm" breaks chain of factual
    18
    causation); 
    Mullins, 389 Mass. at 62
    (superseding cause severs
    chain of proximate causation); 
    Stanfield, 494 S.W.3d at 97
    (superseding cause is new and independent cause that intervenes
    between original wrong and final injury and "thus destroys any
    causal connection between the defendant's negligence and the
    plaintiff's harm, precluding the plaintiff from establishing the
    defendant's negligence as a proximate cause").   But where the
    intervening cause (here, the court's alleged error of law) is
    reasonably foreseeable and the attorney could have taken
    reasonable steps to prevent or mitigate the anticipated harm,
    the intervening cause is a "concurring cause" that leaves the
    causal link between the defendant's negligence and the
    plaintiff's harm unbroken.   See Mullins, supra at 62-63
    (criminal act of third party is not superseding cause that
    excuses negligent security precautions "if such act was, or
    should have been, foreseen"); Stanfield, supra at 100 ("if the
    judicial error alleged to have been a new and independent cause
    is reasonably foreseeable at the time of the defendant's alleged
    negligence, the error is a concurring cause as opposed to a new
    and independent, or superseding, cause").   Because an attorney's
    failure to prevent or mitigate an error of law can be negligent
    only where it is foreseeable that the court would commit the
    error, and because an intervening cause cannot be a superseding
    cause where the error was foreseeable, a judicial error cannot
    19
    be a superseding cause where an attorney is negligent for
    failing to take reasonable steps to prevent or mitigate the
    judicial error or resulting harm.
    Therefore, in determining proximate cause in a legal
    malpractice action where there is an alleged error of law, the
    trier of fact in the "trial within a trial" must determine
    whether the court that foreseeably made the error of law would
    nonetheless have ruled in the client's favor had the attorney
    taken reasonable steps to prevent or mitigate the error of law.
    The standard remains objective, not subjective; the trier of
    fact is not attempting to predict what the judge or judges who
    made the error of law would have done, but is making its own
    determination whether an attorney's reasonable efforts would
    probably have prevented or mitigated the error such that the
    client would have prevailed.   In the context of this case, where
    the court of appeals ruled against Kiribati because Dechert
    failed to submit the evidence it had been furnished that would
    have proved Kiribati's disproportionate payment of attorney's
    fees and its release of valuable claims against Lloyd's,
    Dechert's failure to provide the court with this evidence may be
    found to be the concurrent proximate cause of the court's
    adverse decision.   The judge therefore erred in ruling that
    Kiribati cannot prevail in proving the element of causation.
    Because the judge rested his allowance of Dechert's motion
    20
    for summary judgment on his finding of superseding causation,
    the judge did not reach the issue of negligence.   Inasmuch as
    our review is de novo and Kiribati moved for summary judgment on
    that issue, we do reach it.   Where it is undisputed that the
    court of appeals deferred its decision regarding the assigned
    subrogation claim to allow Kiribati to prove the amount paid in
    consideration for the assignment by showing the "actual price of
    the transfer," and where it was plainly foreseeable from its
    first appellate decision that it would not enforce the
    assignment without such proof, and where Dechert had the
    documentation in its possession that would have demonstrated
    that there was substantial consideration for the assignment, we
    conclude that Dechert's failure to furnish the court of appeals
    with the documentation was so plainly negligent that no expert
    testimony is needed to establish it.7   To prevail on its assigned
    subrogation claim, Kiribati needed the French court both to
    declare the assignment of the subrogation claim valid as a
    matter of law and to enforce it.   It was perfectly reasonable
    7
    We reach this conclusion regardless of whether French or
    Massachusetts law supplies the applicable standard of care.
    Both Dechert's expert, whose testimony the judge credited with
    respect to applicable principles of French law, and Kiribati's
    expert submitted affidavits in which they concluded that French
    lawyers have an obligation to act with reasonable diligence on
    behalf of their clients, a duty similar to that required under
    Massachusetts law. See Pongonis v. Saab, 
    396 Mass. 1005
    , 1005
    (1985) ("An attorney owes his client an obligation to exercise a
    reasonable degree of care and skill . . .").
    21
    for Dechert to argue that enforcement under French law follows
    inevitably from validity, and that it need not prove that
    Kiribati paid substantial consideration for the assignment.      But
    where Dechert possessed the documentation that would have
    enabled Kiribati to prevail on its assigned subrogation claim
    even if the court of appeals concluded that proof of
    consideration was needed to avoid "a double compensation for the
    damages and accordingly an unjust enrichment," it was plainly
    unreasonable for Dechert to fail to argue in the alternative and
    provide the court with this documentation.    Dechert may have
    believed that the court of appeals was wrong as a matter of law,
    but Dechert could have enabled Kiribati to win on its claim even
    if the court of appeals persisted in requiring what Dechert
    contended was an unnecessary factual showing to justify
    enforcement.    In short, Dechert may reasonably have believed
    that the question was solely one of law and not of fact, but
    where it had in its possession the evidence that would have
    enabled Kiribati to demonstrate that Kiribati would not be
    unjustly enriched if the court were to enforce the assignment,
    Dechert's failure to provide the court with that evidence was
    unreasonable.
    We have considered and rejected Dechert's contention that
    it was barred by a confidentiality provision in the second
    settlement agreement from providing the agreement to the court
    22
    of appeals without Lloyd's approval, which Lloyd's withheld.     We
    have examined the settlement agreement, which is a fully
    integrated agreement, and conclude that it contains no
    confidentiality provision that barred such disclosure to the
    court.   Rather, the agreement provides in paragraph twelve,
    "Underwriters shall execute the attached 'ASSIGNMENT OF
    SUBROGATION RIGHTS' that Kiribati may use to facilitate the
    transfer of interests in the Tahiti litigation without
    disclosing the full contents of this Agreement."     The fact that
    an assignment was attached to the agreement that did not
    disclose the full contents of the agreement cannot reasonably be
    interpreted as a confidentiality provision barring such
    disclosure.   Nor can paragraph seven of the settlement agreement
    reasonably be interpreted to bar disclosure of that agreement to
    the court of appeals.   The relevant part of that paragraph
    states, "The fact of this agreement shall not be admissible in
    the future for any purpose, except in an action to enforce this
    agreement or as necessary to implement its terms."    It was
    plainly necessary to disclose the "fact" of the agreement to the
    court of appeals "to implement its terms" where the failure to
    do so would foreseeably cause the court to decline to enforce
    the assignment of subrogation rights provided in that agreement.
    Moreover, it is undisputed that the settlement agreement had
    earlier been filed in a court proceeding in Seattle, Washington,
    23
    with Lloyd's knowledge.
    The scope of damages raises another issue that we address.
    A plaintiff in a negligence action has a duty to mitigate
    damages "that were avoidable by the use of reasonable
    precautions."   Burnham v. Mark IV Homes, Inc., 
    387 Mass. 575
    ,
    586 (1982).   Where a client suffers an adverse decision because
    of both an error of law and an attorney's negligence in failing
    to act reasonably to prevent or mitigate that error, the
    client's duty to mitigate damages might in some circumstances
    require appealing from that adverse decision to a higher court
    to correct the lower court's error of law.    In such cases, the
    loss to the client caused by the attorney's negligence would be
    only the attorney's fees and costs incurred in prosecuting an
    appeal that would not have been necessary had the attorney acted
    with reasonable care.     The defendant, however, bears the burden
    of proving by a preponderance of the evidence that the plaintiff
    failed to fulfil the duty to make reasonable efforts to mitigate
    damages.   See Sheriff of Suffolk County v. Jail Officers &
    Employees of Suffolk County, 
    465 Mass. 584
    , 592 (2013) (in
    wrongful discharge action, employer bears burden of proof on
    issue of mitigation of damages); American Mech. Corp. v. Union
    Mach. Co. of Lynn, 
    21 Mass. App. Ct. 97
    , 103 (1985) ("[T]he
    burden of proving that losses could have been avoided by
    reasonable effort rests with the party in breach").     Here, where
    24
    Dechert recommended against an appeal to the Cour de cassation,
    Dechert cannot possibly meet its burden of proving that Kiribati
    acted unreasonably by failing to appeal from the court of
    appeals decision.   Therefore, the loss proximately caused by
    Dechert's negligence is the loss arising from the adverse ruling
    of the court of appeals on the assigned subrogation claim.
    As a result of this analysis, we need not decide whether
    the judge abused his discretion in striking the affidavit of
    Kiribati's expert on French law.   That expert affidavit is not
    necessary to find that Dechert was negligent where its
    negligence was "obvious," or to find that its negligence was a
    concurrent proximate cause of Kiribati's loss.   See Global NAPs,
    
    Inc., 457 Mass. at 500
    , quoting 
    Pongonis, 396 Mass. at 1005
    .
    Nor is it necessary to decide whether the court of appeals was
    correct in its understanding of French law regarding the
    assignment of subrogation claims, because Kiribati prevails on
    its legal malpractice claim regardless of whether the court of
    appeals was in error.   And we need not determine whether an
    appeal to the Cour de cassation would have resulted in the
    mitigation of damages by the reversal of the court of appeals
    ruling, because Dechert cannot meet its burden of proving that
    Kiribati failed reasonably to mitigate damages by deciding not
    to appeal.
    Conclusion.     We reverse the judge's allowance of Dechert's
    25
    motion for summary judgment and his denial of Kiribati's motion
    for partial summary judgment on its legal malpractice claim, and
    remand the case to the Superior Court for proceedings consistent
    with this opinion.
    So ordered.