Louisiana Criminal Jury Instructions (2017)
§ 6:24 Defense of others—Homicide and other cases
It is justifiable to use force or violence [or to kill] in the defense of another person when it is reasonably apparent that the person attacked could have justifiably used such means himself [herself] and when it is reasonably believed that such intervention is necessary to protect the other person.
Thus, if you find:
(1) that the defendant committed the offense charged while acting in defense of another person; and
(2) that it reasonably appeared to the defendant that the other person justifiably could have used such means himself [herself]; and
(3) that the defendant reasonably believed that his intervention was necessary to protect the other person; then you must find the defendant not guilty.