Washington Pattern Jury Instructions–Criminal (W.P.I.C.)
Part IV. Defenses Chapter 16. Justifiable Homicide
WA W.P.I.C. 16.04.01 Aggressor—Defense of Others
One who acts in defense of another, reasonably believing the other to be the innocent party and in danger, is justified in using force necessary to protect that person even if, in fact, the person whom the actor is defending is the aggressor.