State v. O'Bryan ( 2015 )


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    STATE OF CONNECTICUT v.
    LATASHA R. O’BRYAN
    (SC 19336)
    Rogers, C. J., and Palmer, Zarella, Eveleigh, McDonald, Espinosa and
    Robinson, Js.
    Argued December 2, 2014—officially released September 15, 2015
    Neal Cone, senior assistant public defender, for the
    appellant (defendant).
    Sarah Hanna, assistant state’s attorney, with whom,
    on the brief, were Michael Dearington, state’s attorney,
    and Laura DeLeo, assistant state’s attorney, for the
    appellee (state).
    Opinion
    ROBINSON, J. This appeal presents numerous issues
    concerning the self-defense statute, General Statutes
    § 53a-19,1 and particularly the combat by agreement
    disqualification under § 53a-19 (c) (3). The defendant,
    Latasha R. O’Bryan, appeals2 from the judgment of con-
    viction, rendered after a jury trial, of assault in the
    second degree in violation of General Statutes § 53a-60
    (a) (2), and attempt to commit assault in the first degree
    in violation of General Statutes §§ 53a-49 (a) (2) and
    53a-59 (a) (1). On appeal, the defendant claims that the
    trial court improperly instructed the jury that: (1) with
    respect to the subjective portion of the self-defense
    analysis, the defendant was required to have an ‘‘hon-
    est’’ or ‘‘sincere’’ belief that physical force was going to
    be used against her; (2) she was required to demonstrate
    that she had actual knowledge, rather than merely a
    reasonable belief, that the victim had violated the terms
    of their combat by agreement; and (3) the defendant
    retained the burden of proof once the state asserted a
    theory of combat by agreement. The state disagrees,
    and posits, as an alternative ground for affirmance, that
    the defendant was not harmed by any of the claimed
    improprieties in the jury instruction because any defen-
    dant who is a party to combat by agreement is com-
    pletely disqualified from relying on the justification of
    self-defense, even if the other combatant escalated the
    violence beyond the terms of the agreement. We con-
    clude that the trial court properly instructed the jury.
    Accordingly, we affirm the judgment of the trial court.
    The record reveals the following facts, which the jury
    reasonably could have found,3 and procedural history.
    The defendant and the victim, Lawanda McCrea, lived
    in different units within the same apartment building
    in New Haven. The defendant and the victim had pre-
    viously been friendly but, in the months leading up to
    the Memorial Day weekend of 2010, their relationship
    had deteriorated significantly.4 The friction between
    them had become so great that the defendant had com-
    plained twice to their landlord, Merwin Wade, about
    the victim, saying that ‘‘if she keeps messing with me,
    [I’m going to] beat the shit out of her,’’ and that ‘‘it’s
    getting out of hand now . . . and if she keep[s] both-
    ering me, I’m [going to] whup her butt.’’
    After midnight on May 30, 2010, the victim and her
    cousin, Whitney Nichols, left a cookout and drove to
    the apartment building. Upon arriving at her building,
    the victim saw several people on the porch, including
    the defendant, who had just returned home from a dou-
    ble shift at her job as a nurse’s aide. Given the animosity
    between them, the victim was concerned that the defen-
    dant would start a fight with her. Rather than park their
    vehicle, the victim and Nichols pulled away and stopped
    around the corner from the building. The victim then
    called her uncle, William Murdock, and asked him to
    help her get into her apartment safely because she was
    worried that she might be ‘‘jumped’’ by the defendant
    and the others on the porch. If there was going to be
    a fight, the victim testified, she did not want anyone
    assisting the defendant.
    A few minutes later, Murdock and Wanda Atkins, the
    victim’s aunt, arrived to accompany the victim into her
    apartment. The victim and her family members then
    exited their vehicles and began walking up to the build-
    ing. Murdock was angry that his niece felt threatened
    and had a heated exchange with the people gathered
    on the porch. David Kennedy, another building resident,
    came outside when he heard the raised voices and, after
    speaking with Murdock, returned inside to wake up
    Wade. Murdock, who the defendant testified appeared
    intoxicated, then argued with the defendant, and then
    the defendant and the victim exchanged words, raising
    their voices and cursing at each other.5 The defendant
    told the victim that she wanted a ‘‘fair one.’’6 As the
    victim testified, ‘‘[the defendant] and I both wanted to
    fight each other.’’ Because the victim was wearing a
    sundress and sandals, she went up to her apartment to
    change into ‘‘appropriate fighting attire.’’
    Meanwhile, Wade, having been apprised of the devel-
    oping situation by Kennedy, went outside and directed
    everyone who did not live in the building to get off the
    porch. As the victim returned downstairs, she met Wade
    and explained to him what was happening. Wade told
    the victim to ‘‘just leave it alone’’ because he did not
    want any fighting to take place.
    Notwithstanding Wade’s instructions, the victim went
    out to the porch at the same time that the defendant
    returned with her cousin, Tiny Lester. The victim said
    to the defendant, ‘‘you want your fair one,’’ and then
    walked to meet the defendant on the sidewalk. The
    defendant approached the victim and reiterated that
    she ‘‘want[ed] [her] fair one.’’ The defendant raised her
    fists in a fighting stance and the victim did the same.
    The victim testified that she had no weapons with her,
    although the defendant provided a different account,
    stating that she saw the victim with a lime green colored
    sharp object just as the fight started.
    The defendant swung first with her right hand, strik-
    ing the victim with a small steak knife that she carried
    for both work and self-defense purposes, and the victim
    swung back with her right hand, while her left hand
    was up in a defensive position. The victim never hit the
    defendant because she heard Wade start to scream. The
    victim looked down and realized she had blood on her
    left hand and yelled, ‘‘I’m cut.’’ Atkins started screaming
    that she had seen the blade and that she was calling
    911. The defendant denied having cut the victim, yelling
    that the victim must have cut herself or that maybe her
    fingernails cut the victim.7 At that point, the fight ended
    and the victim returned to the building.
    As she was walking up to her apartment, the victim
    realized that her shirt and entire right breast area were
    soaked in blood. Murdock drove her to the hospital,
    where she received treatment for a chest wound four
    centimeters long and nine to ten centimeters deep. The
    defendant was arrested, but the knife was never
    recovered.8
    The state charged the defendant with assault in the
    second degree in violation of § 53a-60 (a) (2), and
    attempt to commit assault in the first degree in violation
    of §§ 53a-49 (a) (2) and 53a-59 (a) (1). The case was
    tried to a jury, which rejected the defendant’s claim of
    self-defense and found her guilty on all counts. The trial
    court subsequently rendered a judgment of conviction
    in accordance with the jury’s verdict, and sentenced
    the defendant to a total effective sentence of five years
    imprisonment. This appeal followed.
    On appeal, the defendant raises numerous challenges
    to the trial court’s jury instructions on both self-defense
    generally, and combat by agreement specifically. The
    state concedes that the defendant’s instructional
    claims, although unpreserved, are reviewable under
    State v. Golding, 
    213 Conn. 233
    , 239–40, 
    567 A.2d 823
    (1989), because they were not waived and ‘‘[a]n
    improper instruction on a defense, like an improper
    instruction on an element of an offense, is of constitu-
    tional dimension.’’ (Internal quotation marks omitted.)
    State v. Clark, 
    264 Conn. 723
    , 729, 
    826 A.2d 128
    (2003).
    Thus, in considering the defendant’s instructional
    claims, we note that the well established ‘‘test is
    whether the charge, read in its entirety, fairly presents
    the case to the jury in such a way that injustice is not
    done to either party under the established rules of law.
    . . . Thus, [t]he whole charge must be considered from
    the standpoint of its effect on the [jurors] in guiding
    them to the proper verdict . . . and not critically dis-
    sected in a microscopic search for possible error. . . .
    Accordingly, [i]n reviewing a constitutional challenge
    to the trial court’s instruction, we must consider the jury
    charge as a whole to determine whether it is reasonably
    possible that the instruction misled the jury. . . . In
    other words, we must consider whether the instructions
    [in totality] are sufficiently correct in law, adapted to
    the issues and ample for the guidance of the jury.’’
    (Internal quotation marks omitted.) State v. Lavigne,
    
    307 Conn. 592
    , 599–600, 
    57 A.3d 332
    (2012).
    I
    We first consider the defendant’s claim that the trial
    court incorrectly charged the jury on the subjective
    portion of the subjective-objective test for determining
    entitlement to self-defense. Specifically, the defendant
    contends that the court incorrectly required that she
    have an ‘‘honest’’ or ‘‘sincere’’ belief that physical force
    was going to be used against her.9 Relying primarily on
    United States v. Hardin, 
    443 F.2d 735
    (D.C. Cir. 1970),
    the defendant contends that this language is confusing
    because it imports a good faith requirement that goes
    beyond the ‘‘actual belief’’ required by the subjective
    portion of the self-defense analysis. In response, the
    state relies on, inter alia, State v. Prioleau, 
    235 Conn. 274
    , 
    664 A.2d 743
    (1995), and State v. 
    Clark, supra
    ,
    
    264 Conn. 723
    , and contends that the use of the terms
    ‘‘honest’’ and ‘‘sincere’’ is well established in our case
    law and pattern instructions because they are ‘‘syn-
    onyms of the term ‘actual.’ ’’ We agree with the state,
    and conclude that the trial court’s instructions were an
    accurate statement of the law of self-defense that could
    not have misled the jury.
    We begin with a ‘‘brief review of the law of self-
    defense. Under our Penal Code, self-defense, as defined
    in [General Statutes] § 53a-19 (a) . . . is a defense,
    rather than an affirmative defense. . . . Whereas an
    affirmative defense requires the defendant to establish
    his claim by a preponderance of the evidence, a properly
    raised defense places the burden on the state to dis-
    prove the defendant’s claim beyond a reasonable doubt.
    . . . Consequently, a defendant has no burden of per-
    suasion for a claim of self-defense; he has only a burden
    of production. That is, he merely is required to introduce
    sufficient evidence to warrant presenting his claim of
    self-defense to the jury. . . . Once the defendant has
    done so, it becomes the state’s burden to disprove the
    defense beyond a reasonable doubt. . . . Accordingly,
    [u]pon a valid claim of self-defense, a defendant is enti-
    tled to proper jury instructions on the elements of self-
    defense so that the jury may ascertain whether the state
    has met its burden of proving beyond a reasonable
    doubt that the assault was not justified. . . . As these
    principles indicate, therefore, only the state has a bur-
    den of persuasion regarding a self-defense claim: it must
    disprove the claim beyond a reasonable doubt.
    ‘‘It is well settled that under § 53a-19 (a), a person
    may justifiably use deadly physical force in self-defense
    only if he reasonably believes both that (1) his attacker
    is using or about to use deadly physical force against
    him, or is inflicting or about to inflict great bodily harm,
    and (2) that deadly physical force is necessary to repel
    such attack. . . . We repeatedly have indicated that
    the test a jury must apply in analyzing the second
    requirement, i.e., that the defendant reasonably
    believed that deadly force, as opposed to some lesser
    degree of force, was necessary to repel the victim’s
    alleged attack, is a subjective-objective one. The jury
    must view the situation from the perspective of the
    defendant. Section 53a-19 (a) requires, however, that
    the defendant’s belief ultimately must be found to be
    reasonable. . . .
    ‘‘The subjective-objective inquiry into the defendant’s
    belief regarding the necessary degree of force requires
    that the jury make two separate affirmative determina-
    tions in order for the defendant’s claim of self-defense
    to succeed. First, the jury must determine whether, on
    the basis of all of the evidence presented, the defendant
    in fact had believed that he had needed to use deadly
    physical force, as opposed to some lesser degree of
    force, in order to repel the victim’s alleged attack. . . .
    If the jury determines that the defendant had not
    believed that he had needed to employ deadly physical
    force to repel the victim’s attack, the jury’s inquiry ends,
    and the defendant’s self-defense claim must fail. If, how-
    ever, the jury determines that the defendant in fact had
    believed that the use of deadly force was necessary,
    the jury must make a further determination as to
    whether that belief was reasonable, from the perspec-
    tive of a reasonable person in the defendant’s circum-
    stances. . . . Thus, if a jury determines that the
    defendant’s honest belief that he had needed to use
    deadly force, instead of some lesser degree of force,
    was not a reasonable belief, the defendant is not entitled
    to the protection of § 53a-19.’’10 (Citations omitted;
    emphasis omitted; footnotes omitted; internal quotation
    marks omitted.) State v. 
    Clark, supra
    , 
    264 Conn. 730
    –32.
    We conclude that the jury instructions’ use of the
    terms ‘‘honest’’ and ‘‘sincere’’ to describe the nature of
    the subjective belief required by the defendant are an
    accurate statement of the law that are not likely to
    mislead jurors. As the state accurately notes, the well
    established usage of these terms in our case law is
    consistent with the requirement that the ‘‘defendant
    in fact . . . believed that the use of deadly force was
    necessary,’’ before determining ‘‘whether that belief
    was reasonable, from the perspective of a reasonable
    person in the defendant’s circumstances.’’ (Emphasis
    omitted; internal quotation marks omitted.) State v.
    
    Clark, supra
    , 
    264 Conn. 732
    ; see also, e.g., State v. Saun-
    ders, 
    267 Conn. 363
    , 373–74, 
    838 A.2d 186
    , cert. denied,
    
    541 U.S. 1036
    , 
    124 S. Ct. 2113
    , 
    158 L. Ed. 2d 722
    (2004);
    State v. Lemoine, 
    256 Conn. 193
    , 207, 
    770 A.2d 491
    (2001); State v. 
    Prioleau, supra
    , 
    235 Conn. 286
    –87.
    The common usages of the word ‘‘actual,’’ ‘‘honest,’’
    and ‘‘sincere’’ in this context are consistent with the
    subjective aspect of the subjective-objective test pre-
    cluding the use of self-defense as a post hoc rationaliza-
    tion for otherwise criminal conduct. See Merriam-
    Webster’s Collegiate Dictionary (11th Ed. 2003) (defin-
    ing ‘‘actual’’ as ‘‘existing in fact or reality,’’ defining
    ‘‘honest’’ as ‘‘legitimate, truthful’’ or ‘‘genuine, real,’’ and
    defining ‘‘sincere’’ as ‘‘honest’’ or ‘‘true’’). Indeed, even
    assuming that ‘‘the word actual would be preferred to
    the use of the word honest’’ as a matter of draftsman-
    ship, the use of the word honest ‘‘did not impose some
    higher standard of belief in this case, but only required
    a finding that the appellant really believed that he was
    in immediate danger. This is a fair statement of the law
    of self-defense.’’ United States v. 
    Hardin, supra
    , 
    443 F.2d 739
    . Accordingly, we conclude that the jury instruc-
    tions on this point were an accurate statement of the
    law that did not mislead the jury.
    II
    We next turn to the parties’ various claims with
    respect to the combat by agreement disqualification to
    the justification of self-defense under § 53a-19 (c) (3),
    which require us to determine whether: (1) a defendant
    is completely disqualified from claiming self-defense
    after the state proves combat by agreement, even if the
    victim had violated the agreement’s terms by escalating
    the use of force beyond what was originally agreed
    upon; (2) the trial court improperly charged the jury
    that the defendant was required to ‘‘actually know,’’
    rather than ‘‘actually and reasonably believe,’’ that the
    victim had escalated the fistfight from the ‘‘mere use
    of physical force to actual use or imminent use of deadly
    force’’; and (3) the trial court’s instructions properly
    reflected the applicable burden of proof.11
    A
    We begin with the state’s alternative ground for
    affirmance, which responds to the defendant’s chal-
    lenges to the jury instructions on § 53a-19 (c) (3) by
    arguing that a finding of illegal combat by agreement
    completely disqualifies a defendant from claiming that
    his conduct was justified because he acted in self-
    defense. Specifically, the state argues that any instruc-
    tional error ‘‘could not have harmed the defendant
    because it was beneficial to her. Because our statute
    makes clear that there is no exception to the combat
    by agreement disqualifier, upon the jury’s finding of a
    combat by agreement, self-defense becomes inapplica-
    ble,’’ despite the fact that the victim may have ‘‘violated
    the terms of the agreement and escalated the level of
    force beyond what the two had agreed upon . . . .’’ In
    response, the defendant cites, for example, Huber v.
    United States, 
    259 F. 766
    (9th Cir. 1919), and Grant
    v. State, 
    120 Ga. App. 244
    , 
    170 S.E.2d 55
    (1969), and
    contends, inter alia, that the state’s argument misstates
    the law of combat by agreement because it is well
    established at common law that the requisite agreement
    must be for mutual combat on ‘‘equal terms.’’ (Internal
    quotation marks omitted.) We agree with the defen-
    dant’s reading of § 53a-19 (c) (3), and conclude that the
    trial court’s jury instructions on the topic of combat by
    agreement properly reflected the common-law principle
    that the requisite agreement does not exist when one
    party unilaterally and dangerously escalates the pre-
    viously equal terms of a fight.
    Because this issue presents a question of statutory
    interpretation, which ‘‘is a question of law, our review
    is de novo. . . . When construing a statute, [o]ur funda-
    mental objective is to ascertain and give effect to the
    apparent intent of the legislature. . . . In other words,
    we seek to determine, in a reasoned manner, the mean-
    ing of the statutory language as applied to the facts
    of [the] case, including the question of whether the
    language actually does apply. . . . In seeking to deter-
    mine that meaning, General Statutes § 1-2z directs us
    first to consider the text of the statute itself and its
    relationship to other statutes. If, after examining such
    text and considering such relationship, the meaning of
    such text is plain and unambiguous and does not yield
    absurd or unworkable results, extratextual evidence of
    the meaning of the statute shall not be considered. . . .
    The test to determine ambiguity is whether the statute,
    when read in context, is susceptible to more than one
    reasonable interpretation. . . . When a statute is not
    plain and unambiguous, we also look for interpretive
    guidance to the legislative history and circumstances
    surrounding its enactment, to the legislative policy it
    was designed to implement, and to its relationship to
    existing legislation and common law principles govern-
    ing the same general subject matter . . . .’’ (Internal
    quotation marks omitted.) State v. Buckland, 
    313 Conn. 205
    , 224, 
    96 A.3d 1163
    (2014), cert. denied,     U.S. ,
    
    135 S. Ct. 992
    , 
    190 L. Ed. 2d 837
    (2015).
    We conclude at the outset that § 53a-19 (c) (3) is
    ambiguous, thus permitting resort to extratextual evi-
    dence in accordance with § 1-2z. Specifically, the state’s
    reading of the language of § 53a-19 (c) (3) is reason-
    able—at least facially—insofar as there is a plausible
    policy reason for denying those who enter into fights
    a right to claim self-defense. We also, however, find
    reasonable the defendant’s reading of the statute, which
    would permit the use of reasonable force in self-defense
    when a fight escalates beyond a previously agreed-upon
    level, because that interpretation relies upon the term
    ‘‘agreement’’ as embodying some mutual consent to the
    level of force involved in the encounter. Moreover, the
    state’s facially plausible reading of the statute has the
    bizarre result of privileging an initial aggressor with
    some right of self-defense under subdivision (2) of sub-
    section (c), while depriving the mutual combatant
    under subdivision (3) of subsection (c) of any right of
    self-defense—even when his opponent brings a gun to
    an agreed upon fistfight. Accordingly, we look beyond
    the text of the statute.
    We begin by reviewing some background principles
    concerning combat by agreement under Connecticut
    law. Combat by agreement, often referred to as ‘‘mutual
    combat,’’ is an exception that operates as a statutory
    disqualification from the justification defense of self-
    defense. ‘‘A jury instruction regarding the combat by
    agreement exception to self-defense is warranted when
    the evidence is sufficient to support a reasonable infer-
    ence that such a mutual combat occurred.’’ (Internal
    quotation marks omitted.) State v. Montanez, 
    277 Conn. 735
    , 747, 
    894 A.2d 928
    (2006). ‘‘The agreement required
    by . . . § 53a-19 (c) (3) need not be formal or express.’’
    State v. Silveira, 
    198 Conn. 454
    , 471, 
    503 A.2d 599
    (1986).
    Such an agreement may be tacit and inferred from the
    facts and circumstances of the case. See State v. Mon-
    
    tanez, supra
    , 747–48 (sufficient evidence to warrant
    combat by agreement instruction when friend urged
    one brother to fight with defendant, who returned with
    his brother and challenged defendant’s friend to fight
    ‘‘man-to-man’’); State v. 
    Silveira, supra
    , 471 (sufficient
    evidence to warrant combat by agreement instruction
    when defendant and his friends had gone to bar ‘‘to
    assist friends who they had heard were in trouble,’’
    then ‘‘became embroiled in an altercation’’ with another
    person, who ‘‘entered the bar and returned shortly with
    companions of his own,’’ who ‘‘converge[d] on the
    defendant’s group, with the resulting acceleration of
    hostilities’’); State v. Johnson, 
    53 Conn. App. 476
    , 481–
    82, 
    733 A.2d 852
    (sufficient evidence to justify instruc-
    tion on combat by agreement when victim and
    defendant ‘‘argued, displayed their weapons, walked to
    the middle of the street armed and angry and confronted
    each other’’ before ‘‘defendant fired three shots that
    killed the victim’’), cert. denied, 
    249 Conn. 929
    , 
    733 A.2d 849
    (1999).
    Our cases have not, however, considered the requisite
    mutuality of the terms of the combat by agreement,
    or, put differently, the legal effect of an altercation
    escalating beyond its apparently agreed upon terms.
    Stated another way, the question arising in the present
    case is whether combat by agreement exists, as a matter
    of law, when the parties to an altercation purport to
    agree to a fair fistfight, and one party breaches that
    agreement by, for example, introducing a deadly
    weapon. In addressing this lacuna,12 we note that
    although our Penal Code lacks specific commentary on
    this point, the drafters of § 53a-19 emphasized that the
    justification defenses generally ‘‘attempt to restate the
    common law.’’ Commission to Revise the Criminal Stat-
    utes, Connecticut Penal Code Comments (1972) p. 7.
    Indeed, this court has previously noted that ‘‘[t]he stat-
    utes which enumerate the situations where the use of
    force is justified’’ should ‘‘ ‘be read in the light of their
    common law background, and the fact that an individual
    section does not fully state the relevant common law
    rule, with all [of] its possible applications, exceptions,
    or implications, should not prevent a court from reading
    it as incorporating the full body of common law rules
    relevant thereto.’ ’’13 State v. Terwilliger, 
    314 Conn. 618
    ,
    654, 
    104 A.3d 638
    (2014), quoting Commission to Revise
    the Criminal Statutes, Connecticut Penal Code Com-
    ments, supra, p. 7. Our review of sister jurisdictions’
    case law and scholarly commentary on this topic dem-
    onstrates that the state’s interpretation of § 53a-19 (c)
    (3) contravenes the drafters’ expressed intent because it
    is wholly inconsistent with the common-law principles
    that underlie the statute.14
    As with contracts generally, the common-law analyti-
    cal key to combat by agreement is mutual consent. As
    Professor Paul Robinson notes in his landmark treatise,
    statutory provisions that ‘‘deny a defensive force justifi-
    cation to both parties engaged in unauthorized mutual
    combat’’ are ‘‘analogous’’ to those under which ‘‘the
    threatened harm not be consented to by the actor.’’15 2
    P. Robinson, Criminal Law Defenses (1984) § 132, p.
    98. Professor Robinson describes mutual combat provi-
    sions as a ‘‘response to the evidentiary problems of
    determining who the initial aggressor was in such cases,
    a fact that can, in some jurisdictions, determine which
    participant will be given a defense.’’ 
    Id. He describes
    such provisions as potentially ‘‘unnecessary,’’ insofar as
    actors engaged in ‘‘mutual combat both are employing
    aggressive, rather than defensive force, and neither
    actor’s conduct is necessary to his defense and is, for
    that reason, unjustified.’’ 
    Id., pp. 98–99.
    This suggests
    then, that there simply is no agreement to engage in
    mutual combat when one party escalates the fight
    beyond that which the parties had contemplated.
    Consistent with Professor Robinson’s view of combat
    by agreement, we agree with the South Carolina
    Supreme Court that combat by agreement exists only
    when there is a ‘‘mutual agreement to fight on equal
    terms for purposes other than protection,’’ because that
    equality ‘‘is inherently inconsistent with the concept of
    self-defense, and directly conflicts with the ‘no fault’
    finding necessary to establish self-defense.’’ (Emphasis
    added.) State v. Taylor, 
    356 S.C. 227
    , 234, 
    589 S.E.2d 1
    (2003). Thus, the court held that there was insufficient
    evidence to justify a mutual combat charge when there
    was, in addition to no evidence of ‘‘pre-existing ill-will
    or dispute’’ between the victim and the defendant, also
    no evidence that the parties knew that each other were
    armed. 
    Id. Similarly, the
    Georgia courts have held that
    ‘‘[m]utual combat usually arises when the parties are
    armed with deadly weapons and mutually agree or
    intend to fight with them. Mutual combat does not mean
    a mere [fistfight] or scuffle.’’ Grant v. 
    State, supra
    , 
    120 Ga. App. 244
    ; see also Huber v. United 
    States, supra
    , 
    259 F. 771
    (improper to instruct jury that ‘‘if one willingly
    entered into a mutual combat with another, without
    any intent to do great bodily harm, and thereupon his
    adversary resorted to a deadly weapon and was about
    to assault him therewith, he would not have the right
    to defend himself or resort to such a weapon in his
    necessary self-defense’’ [internal quotation marks omit-
    ted]); Eckhardt v. People, 
    126 Colo. 18
    , 25, 
    247 P.2d 673
    (1952) (‘‘Ordinarily the defense of self-defense in strictly
    mutual combat is not allowable, but a limitation on the
    right of self-defense does not arise alone from the fact
    that the two parties here were mutually engaged in a
    fistfight. An agreement to combat and finish their trou-
    bles must exist and must be in the nature of an anteced-
    ent agreement to so fight.’’); Flowers v. State, 146 Ga.
    App. 692, 
    247 S.E.2d 217
    (1978) (improper to charge on
    mutual combat when evidence was that defendant and
    victim ‘‘had been engaged in a game they called ‘mercy’;
    the game was a simple showdown of strength where
    each man tried to out-grip the other’s hand,’’ which
    devolved into fistfight and ultimately guns were pro-
    duced, insofar as ‘‘there is no evidence showing that
    these men agreed to fight with weapons’’); accord State
    v. Crisantos, 
    102 N.J. 265
    , 274, 
    508 A.2d 167
    (1986)
    (noting that mutual combat, for purposes of reducing
    murder to manslaughter at common law, requires that
    ‘‘the contest must have been waged on equal terms and
    no unfair advantage taken of the deceased’’ [internal
    quotation marks omitted]).
    In light of the persuasive logic of these authorities, we
    conclude that the combat by agreement disqualification
    under § 53a-19 (c) (3) did not preclude the defendant
    from relying on the justification of self-defense as a
    matter of law. In our view, the state’s arguments to the
    contrary foster the illogical and dangerous result of
    depriving a participant in a supposedly fair fistfight of
    the right to self-defense when his or her opponent
    shows up with a deadly weapon, an unexpected gang
    of supporters, or an unexpected gang of supporters
    wielding deadly weapons. In contrast, we view the
    instruction given by the trial court as consistent with
    the well established common-law principle requiring
    mutual consent as to the terms of engagement, notwith-
    standing the fact that those terms might lack the accep-
    tance and pedigree of those sponsored by the Ninth
    Marquess of Queensbury.16 Put differently, an escalation
    in the encounter beyond a fistfight meant that there
    was, in essence, no agreement at all. Accordingly, we
    disagree with the state’s argument that the defendant’s
    intention to have a ‘‘fair one’’ with the victim, without
    weapons or other friends participating,17 constituted
    combat by agreement that disqualified her as a matter
    of law pursuant to § 53a-19 (c) (3) from claiming self-
    defense in the instance the fight escalated beyond the
    agreed upon terms.18
    B
    We now turn to the defendant’s first challenge to the
    portion of the jury instruction charging the jury on
    combat by agreement, namely, that the trial court
    improperly charged that the defendant was required to
    ‘‘actually know,’’ rather than ‘‘actually and reasonably
    believe,’’ that the victim had escalated the fistfight from
    the ‘‘mere use of physical force to actual use or immi-
    nent use of deadly force . . . .’’ The defendant con-
    tends that this instruction was improper because a
    defendant is required only to have a ‘‘reasonable belief’’
    that the other party escalated the confrontation, rather
    than actual knowledge, and argues that State v. Abra-
    ham, 
    84 Conn. App. 551
    , 557–58, 
    854 A.2d 89
    , cert.
    denied, 
    271 Conn. 938
    , 
    861 A.2d 514
    (2004), which the
    Criminal Jury Instructions Committee cited as authority
    for that pattern charge, does not support that portion
    of the instruction. In response, the state argues, inter
    alia, that under State v. 
    Silveira, supra
    , 
    198 Conn. 454
    ,
    ‘‘the self-defense disqualifiers in § 53a-19 (c) are [not]
    assessed from the defendant’s perspective and his rea-
    sonable beliefs.’’ We agree with the state, and conclude
    that the jury instructions did not misstate the law gov-
    erning combat by agreement.
    In Silveira, this court concluded that the proviso in
    § 53a-19 (a) makes ‘‘subsection (a) expressly subject to
    subsections (b) and (c),’’ meaning that the legislature
    made plain and unambiguous ‘‘its intent that the use of
    force in self-defense or defense of another, as provided
    in subsection (a), is not justified where a defendant has
    engaged in the conduct described in subsection (c). The
    issue under subsection (c) is not whether the defendant
    reasonably believed that he provoked the use of force,
    or that he was the initial aggressor, or that there existed
    an agreement to engage in combat. The issue, rather,
    is whether the defendant did provoke the use of force,
    or was the initial aggressor, or did agree to engage in
    combat. The trial court did not err in refusing to instruct
    that the exceptions of provocation, aggression and com-
    bat by agreement must be considered from the perspec-
    tive of the defendant.’’ (Emphasis altered.) State v.
    
    Silveira, supra
    , 
    198 Conn. 470
    ; see also 
    id., 469 (‘‘by
    the terms of the statute, the use of force in self-defense
    or defense of another is never justified where the condi-
    tions set forth in subsection [c] [of § 53a-19] are found
    to exist’’).
    We conclude that the trial court’s instruction, requir-
    ing the defendant to ‘‘[know] of such a violation’’ of the
    terms of the mutual combat agreement, is a correct
    statement of the law. Although the defendant accurately
    observes that the pattern instruction on which it was
    based is not doctrinally supported by State v. 
    Abraham, supra
    , 
    84 Conn. App. 558
    ; see also footnote 12 of this
    opinion; the charge nevertheless is consistent with State
    v. 
    Silveira, supra
    , 
    198 Conn. 470
    , which requires the
    jury to decide what actually happened, rather than what
    the defendant reasonably might have perceived what
    happened. Second, it is consistent with the overarching
    subjective-objective standard by which self-defense
    claims are determined, under which objective reason-
    ableness is considered only if the defendant himself
    perceived the need for self-defense at the time of the
    altercation. See, e.g., State v. 
    Clark, supra
    , 
    264 Conn. 730
    –32. Accordingly, we conclude that the trial court’s
    instruction on this point did not misstate the law of
    self-defense.
    C
    Finally, we turn to the defendant’s claim that the jury
    instructions did not place the correct burden of proof
    on the state with respect to the proof of the statutory
    disqualifier of combat by agreement, in particular by
    (1) shifting the burden of proof to the defense, and (2)
    failing to direct the jury that the state retained the
    burden of disproving self-defense or proving combat
    by agreement by a reasonable doubt.19 In response, the
    state contends that read in their entirety, the trial court’s
    jury instructions properly informed the jury of the
    state’s burden of proof. We agree with the state, and
    conclude that the trial court’s self-defense charge did
    not misstate the burden of proof.
    Viewing the charge in its entirety, as we must; see,
    e.g., State v. 
    Lavigne, supra
    , 
    307 Conn. 599
    –600; we
    conclude that the instructions properly stated the bur-
    den of proof, both as to self-defense generally and with
    respect to the combat by agreement statutory disquali-
    fier specifically. The trial court repeatedly reminded
    the jury that: (1) the state bore the burden of disproving
    self-defense beyond a reasonable doubt as a general
    matter; (2) the state bore the burden of proving the
    statutory disqualifiers, including combat by agreement
    and retreat; and (3) the defendant had no burden of
    proof at all. Contrary to the defendant’s arguments, we
    conclude that the jury charge properly articulated the
    state’s burden of proof with respect to self-defense gen-
    erally, and combat by agreement specifically. See, e.g.,
    State v. 
    Clark, supra
    , 
    264 Conn. 730
    –31.
    The judgment is affirmed.
    In this opinion ROGERS, C. J., and PALMER,
    ZARELLA, EVELEIGH and McDONALD, Js., concurred.
    1
    General Statutes § 53a-19 provides in relevant part: ‘‘(a) Except as pro-
    vided in subsections (b) and (c) of this section, a person is justified in using
    reasonable physical force upon another person to defend himself or a third
    person from what he reasonably believes to be the use or imminent use of
    physical force, and he may use such degree of force which he reasonably
    believes to be necessary for such purpose; except that deadly physical force
    may not be used unless the actor reasonably believes that such other person
    is (1) using or about to use deadly physical force, or (2) inflicting or about
    to inflict great bodily harm.
    ‘‘(b) Notwithstanding the provisions of subsection (a) of this section, a
    person is not justified in using deadly physical force upon another person
    if he or she knows that he or she can avoid the necessity of using such
    force with complete safety (1) by retreating, except that the actor shall not
    be required to retreat if he or she is in his or her dwelling, as defined in
    section 53a-100, or place of work and was not the initial aggressor . . . .
    ‘‘(c) Notwithstanding the provisions of subsection (a) of this section, a
    person is not justified in using physical force when (1) with intent to cause
    physical injury or death to another person, he provokes the use of physical
    force by such other person, or (2) he is the initial aggressor, except that
    his use of physical force upon another person under such circumstances is
    justifiable if he withdraws from the encounter and effectively communicates
    to such other person his intent to do so, but such other person notwithstand-
    ing continues or threatens the use of physical force, or (3) the physical
    force involved was the product of a combat by agreement not specifically
    authorized by law.’’
    Although this statute has been amended by our legislature since the
    events giving rise to this appeal; see Public Acts 2010, No. 10-36, § 15; that
    amendment has no bearing on the merits of the present case. Accordingly,
    for the sake of simplicity, we refer to the current revision of the statute.
    2
    The defendant appealed from the judgment of the trial court to the
    Appellate Court. Thereafter, we granted the defendant’s motion to transfer
    the appeal to this court in accordance with General Statutes § 51-199 (c)
    and Practice Book § 65-2.
    3
    At trial, the defendant and the state presented two different versions of
    the events that led to this appeal. The defendant claimed that the victim,
    without provocation, simply attacked her and that she had reacted in self-
    defense. The state, however, contended that the defendant and the victim
    had engaged in an illegal combat by agreement. To provide greater context
    for what the jury was required to determine at trial, evidence in support of
    the defendant’s version of events is set forth in the footnotes of this opinion.
    4
    The defendant testified that she had helped the victim by doing things
    such as giving her food and driving her places. The victim, however, had
    been saying negative things about the defendant and the defendant knew
    that the victim had a reputation for violence. In the period leading up to
    the Memorial Day weekend of 2010, the defendant had stopped associating
    with the victim.
    5
    The defendant testified that after Kennedy came outside and other people
    came downstairs from the victim’s apartment, James Turner, another resi-
    dent, advised the defendant to leave, saying it was not safe for her to stay
    there. The defendant further testified that the victim and her family had
    blocked the entrance to the building so the defendant could not get to her
    apartment. The defendant was scared and Murdock’s aggression toward her
    caused her to have flashbacks to physical abuse she had suffered at the
    hands of her former husband. She left and walked around the corner to
    the home of her cousin, Tiny Lester, where she explained to Lester what
    was happening.
    Lester then offered to help the defendant get into her apartment because
    the defendant’s children and goddaughter were there, and the defendant
    feared for their safety. Because Lester knew the victim’s family, the defen-
    dant hoped that Lester would be able to calm them down and that she
    would be able to get into her apartment safely. Lester and the defendant
    walked back to the defendant’s building.
    When they arrived in front of the building, Lester and the defendant
    stopped outside the gate in front, and Lester said, ‘‘she don’t got time for
    this; let her go upstairs; there’s kids in this house; let her go upstairs; she
    don’t got time for this.’’ The altercation between the victim and the defendant
    happened shortly thereafter.
    6
    Testimony offered at trial by some of the state’s witnesses established
    that the defendant and the victim understood a ‘‘fair one’’ to be a fair fight
    between the parties involved in the dispute, involving only those two people
    and with no assistance from other individuals and no weapons—just fists
    and feet.
    7
    More specifically, the defendant testified that one of the victim’s cousins
    had handed a lime green object to the victim. The victim then said that she
    was going to attack the defendant, and charged toward her.
    The defendant testified that, as the victim approached, the defendant
    realized that the lime green object in the victim’s hand was sharp, and raised
    her hands up to cover her face. The defendant then drew the small, two
    inch steak knife in self-defense. The defendant testified that the victim
    swung first, slashing downward at the defendant with the lime green object,
    but missing because the defendant stumbled backward. The victim moved
    so quickly that the defendant could not get away. Out of fear, the defendant
    closed her eyes and swung with the steak knife in her hand in order to try
    to protect herself. She did not realize that she had cut the victim until she
    heard the victim shout that she was cut.
    8
    The defendant testified that she was nervous and froze, and originally
    denied that she had cut the victim because she was scared and did not
    realize that the law allowed her to protect herself. The defendant then tossed
    the knife under a nearby vehicle. One witness, James Turner, testified that
    the whole altercation could not have lasted more than four seconds.
    The defendant further testified that, when the victim came back outside
    to go to the hospital, the defendant did not see any blood on the victim and
    only knew that the victim had been cut. The defendant’s cell phone was
    not charged so she was unable to call 911 to explain that she had just been
    attacked by the victim. Instead, she approached Atkins, who was on the
    telephone with the 911 dispatcher, and told her: ‘‘[M]ake sure you tell the
    cops that you guys came to jump me.’’ As soon as the police arrived, the
    defendant approached an officer to explain what had happened.
    9
    We note that the following portions of the self-defense instruction pro-
    vided by the court are relevant to this claim on appeal: ‘‘The [test] you are
    to apply is a subjective objective test, meaning that it has some subjective
    aspects and some objective aspects. You must consider the situation from
    the perspective of the defendant; that is, what did the defendant actually
    believe as best as can be inferred from the evidence. This is the subjective
    aspect of the test. . . .
    ‘‘The first question you must ask is simply as a matter of fact whether
    the defendant actually, that is honestly and sincerely, entertained the belief
    in question when she acted as she did. . . . A defendant cannot justifiably
    act on her actual belief however honestly or sincerely she held it if that
    belief would not have been shared by a reasonable person in our circum-
    stances viewing those circumstances from the defendant’s point of view.
    ‘‘[T]he defense of self-defense has four elements. One, that the defendant
    actually believed that someone was using or was about to use physical force
    against her. If you find that the force used by the defendant was deadly
    physical force, then this element requires that the defendant actually believed
    that the other person was, A, using or about to use deadly physical force
    against her or, B, was inflicting or about to inflict great bodily harm upon
    her. . . .
    ‘‘Element three, that the defendant actually believed that the degree of
    force she used was necessary to repel the attack. Again, if you find that
    that force used by the defendant was deadly physical force, then this element
    requires that the defendant actually believed that deadly physical force was
    necessary to repel the attack. . . .
    ‘‘Now, I’ll go over these elements again in detail from that perspective.
    The first element is that when the defendant used offensive force against
    [the victim] she actually, that is honestly and sincerely, believed that the
    other person was using or about to use physical force against her. . . .
    ‘‘If you have found that the force used by the defendant was deadly
    physical force, then you must find the defendant actually believed that [the
    victim] was not only using or about the use physical force upon her but
    that the other person, namely [the victim] . . . was either using or about
    to use deadly physical force against the defendant or inflicting or about to
    inflict great bodily harm upon her. . . .
    ‘‘The act of [the victim] leading to the defendant’s use of defensive physical
    force may not be [an] actual threat . . . or an actual assault. The test is
    not what the other person actually intended but what the other person’s
    act caused the defendant to believe was the intention of the other. In other
    words, the danger to which the defendant was reacting may not have been
    . . . actual or real. In judging a danger to herself, the defendant is not
    required to act with infallible judgment. A person acting in self-defense is
    sometimes required to act instantly and without time to deliberate and
    investigate. Under some circumstances, it is possible . . . to perceive an
    actual threat when none, in fact, existed. . . .
    ‘‘The third element is that when the defendant used physical force upon
    [the victim] for the purposes of defending herself she actually, that is honestly
    and sincerely, believed that the degree of force she used was necessary for
    that purpose. And this applies whether you have found that the defendant
    used deadly physical force or not. The question is whether the defendant
    believed that it was necessary to use the degree of force that she used to
    defend herself from the attack.’’ (Emphasis added.)
    10
    For a comprehensive doctrinal explanation of justification defenses
    such as self-defense, see State v. Singleton, 
    292 Conn. 734
    , 746–49, 
    974 A.2d 679
    (2009), and State v. Montanez, 
    277 Conn. 735
    , 752–53, 
    894 A.2d 928
    (2006).
    11
    We note that, with respect to combat by agreement, the trial court
    charged the jury that ‘‘another circumstance under which a person is not
    justified in using any degree of physical force in self-defense against another
    is when the physical force is the product of an illegal combat by agreement.
    Under this provision, it is not necessary that there be a formal agreement.
    Such agreement may be inferred from the conduct of the parties. To infer
    such an agreement, you must look at all the circumstances leading up to
    and preceding the event in question as well as all of the circumstances
    surrounding this event itself based on the entire evidence presented in your
    own credibility assessments. This exception would not apply despite an
    agreement for mutual combat if you find that the terms were violated by
    [the victim] and that her conduct [toward] the defendant was in violation
    of their agreement. And further, that the defendant knew of such a violation.
    Violation means that [the victim’s] use of force exceeded the terms of the
    agreement with the defendant and that it escalated beyond what they had
    then agreed to as . . . to either the extent or form of . . . combat.
    ‘‘It is important to remember that the defendant has no burden of proof
    to prove that her use of physical force was not the product of a combat by
    agreement. To the contrary, you may only reject her defense on the basis
    of the statutory disqualification if you find that the state . . . has proved
    beyond a reasonable doubt that the defendant and . . . [the victim] had
    engaged in . . . combat by agreement.’’ (Emphasis added.)
    We note that this instruction mirrors the pattern jury instruction promul-
    gated by the Criminal Jury Instructions Committee, which is published on
    the Judicial Branch website. See Connecticut Criminal Jury Instructions
    (4th Ed. 2011) § 2.8-2 (C), available at http://www.jud.ct.gov/JI/criminal/
    part2/2.8-2.htm (last visited September 1, 2015).
    For the challenged portion of the instruction pertaining to the burden of
    proof, see footnote 19 of this opinion.
    12
    The Criminal Jury Instructions Committee cited the Appellate Court’s
    decision in State v. Abraham, 
    84 Conn. App. 551
    , 
    854 A.2d 89
    , cert. denied,
    
    271 Conn. 938
    , 
    861 A.2d 514
    (2004), as authority for the pattern jury instruc-
    tion utilized by the trial court in this case. The Appellate Court’s opinion
    in Abraham recited, but did not address the legal accuracy of, the challenged
    instruction on this particular point and, therefore, is of minimal persuasive
    value in the present appeal. See 
    id., 559–60 (considering
    whether sufficient
    evidence of combat by agreement existed when defendant claimed that he
    was mere bystander who had intervened in defense of another person).
    13
    To this end, we note that § 53a-19, like much of our state’s Penal Code,
    is modeled heavily after coordinate provisions of New York’s Penal Code;
    although principles stated in the Model Penal Code are also informative in
    its interpretation. See, e.g., State v. Pond, 
    315 Conn. 451
    , 483, 
    108 A.3d 1083
    (2015). The parties do not cite, and our independent research did not reveal,
    any on point New York cases under that state’s identical combat by
    agreement statute. N.Y. Penal Law § 35.15 (McKinney 2009).
    14
    The concurring justice criticizes our reliance on common-law principles
    to resolve this ambiguity as ‘‘inconsistent’’ with State v. Singleton, 
    292 Conn. 734
    , 
    974 A.2d 679
    (2009), asking rhetorically how we ‘‘can use common-law
    principles to find an exception not explicitly written in this provision of the
    same statute when a party to a combat by agreement escalates the level
    of violence.’’ As the concurrence accurately points out, in Singleton, we
    disagreed with a defendant’s claim that the trial court had improperly failed
    to instruct the jury that ‘‘the initial aggressor using nondeadly force who is
    met with deadly force by the victim may be justified in using deadly force
    to repel the victim.’’ 
    Id., 764. We
    held that the defendant’s argument was
    inconsistent with the ‘‘plain and unambiguous’’ language of § 53a-19 (c) (2),
    which ‘‘provides that the initial aggressor is justified in using physical force
    only if he withdraws from the encounter and certain other conditions are
    satisfied. It does not provide, or suggest, that an initial aggressor who
    uses nondeadly force is justified in using deadly force to repel the victim’s
    unlawful escalation of force to the deadly level.’’ (Emphasis added.) 
    Id., 765. Our
    resort to common-law principles in this case is not inconsistent with
    Singleton, because that case concerned plain and unambiguous statutory
    language. In contrast, the present case presents statutory language that a
    majority of this court deems ambiguous as to the meaning of the term
    ‘‘agreement’’ under § 53a-19 (c) (3), rendering appropriate resort to common-
    law principles to resolve that ambiguity in accordance with the drafters’
    intent. See General Statutes § 1-2z.
    15
    The American Law Institute followed this consent approach in drafting
    the Model Penal Code, which lacks an express combat by agreement provi-
    sion. The commentary to the Model Penal Code notes that it ‘‘accomplished’’
    that same principle insofar as it ‘‘allows forceful responses only to ‘unlawful
    force’ and defines that term . . . not to include force to which the recipient
    has consented.’’ 1 A.L.I., Model Penal Code and Commentaries (1985) § 3.04,
    comment 3 (c), p. 47; see also 
    id., § 3.11,
    p. 156 (‘‘ ‘unlawful force’ means
    force, including confinement, that is employed without the consent of the
    person against whom it is directed’’). The commentary observes that the
    ‘‘question of consent presents a problem of some difficulty. It is desirable,
    on the one hand, to exclude from the range of protective force, especially
    of force employed for the protection of another, most cases in which the
    person sought to be protected has in fact consented, whether or not the
    law would otherwise give legal effect to the consent. Thus A and B may
    agree to fight under such conditions that they both are guilty of a crime
    and such that, according to some decisions, they have cross actions for
    battery against each other, their consent being denied legal effect.’’ 
    Id., § 3.11,
    comment 1, pp. 157–58.
    16
    The Queensbury Rules were a ‘‘code of rules that most directly influ-
    enced modern boxing. Written by John Graham Chambers, a member of
    the British Amateur Athletic Club, the rules were first published in 1867
    under the sponsorship of John Sholto Douglas, ninth marquess of Queens-
    berry, from whom they take their name.’’ Encylopaedia Brittanica, ‘‘Marquess
    of Queensbury Rules,’’ (2015), available at http://www.britannica.com/
    sports/Marquess-of-Queensberry-Rules (last visited September 1, 2015).
    17
    See footnote 6 of this opinion.
    18
    The concurrence also posits that, because ‘‘fights develop without
    advanced planning, and that we can find combat by agreement even without
    any express agreement to fight, it seems unlikely that the parties would
    establish specific terms, including the level of force to be used, prior to the
    commencement of the fight.’’ We disagree with the concurrence’s reliance
    on this speculative generalization, and instead emphasize that the existence
    of an agreement to fight, including any limitations on the type or amount
    of force permissible and the breach of those limitations, is a question of
    fact for the trier. See, e.g., State v. Mon
    tanez, supra
    , 
    277 Conn. 747
    –48.
    19
    We note that the trial court directed the jury generally that the ‘‘state
    must not only prove beyond a reasonable doubt all of the elements of the
    crime charged in order to obtain a conviction, but must also disprove beyond
    a reasonable doubt that the defendant acted in self-defense. If the state fails
    to disprove beyond a reasonable doubt the defendant acted in self-defense,
    you must find the defendant not guilty despite the fact that you have found
    the elements of the crime proved beyond a reasonable doubt. The defendant
    has no burden of proof whatsoever [with] respect to this defense.’’ After
    discussing the substantive elements of self-defense, the trial court again
    reminded the jury ‘‘that the defendant has no burden of proof regarding any
    of these elements. Instead, the state bears the sole and exclusive burden
    of proving beyond a reasonable doubt that the defendant did not act in self-
    defense . . . a burden that it can meet by disproving at least one of these
    elements beyond a reasonable doubt.’’
    The trial court then repeated those burdens with respect to the statutory
    disqualifications, stating that ‘‘the state can defeat the defendant’s claim of
    self-defense by proving one of the statutory disqualifications to the use of
    deadly physical force,’’ including retreat and combat by agreement, and
    again emphasizing that the defendant ‘‘has no burden [of proof] whatsoever’’
    with respect to either retreat or combat by agreement.
    With respect to combat by agreement, after explaining the elements, the
    trial court instructed the jury that ‘‘[i]t is important to remember that the
    defendant has no burden of proof to prove that her use of physical force
    was not the product of a combat by agreement. To the contrary, you may
    only reject her defense on the basis of the statutory disqualification if you
    find that the state has proved . . . beyond a reasonable doubt that the
    defendant and [the victim] had engaged in . . . combat by agreement.
    ‘‘I said this several times but it bears repeat[ing]. You must remember
    that the defendant has no burden of proof whatsoever [with] respect to the
    defense of self-defense. Instead, it is the state that must prove beyond a
    reasonable doubt that the defendant did not act in self-defense if it is to
    prevail on its charges of assault in the second degree and criminal attempt
    of assault in the first degree. To meet this burden, the state need not disprove
    all four of the elements of self-defense. Instead, it can defeat the defense
    of self-defense by disproving any one of the four elements of self-defense
    beyond a reasonable doubt to your unanimous satisfaction.’’