what are the two complications to the use of deadly force:
intitial aggressor rule: may not use deadly force if he is the initial aggressor, but he can regain this right if he withdraws from the fices and communicates this withrawal or the victim suddenly escalates a non deadly fight to a deadly one
retreat rule: in some states a defendant is required to retreat before using deadly force in self defense. Majoirty rule is that this is not required. Minority rule is that this is required uniless no retreat in complete safety or D is in home of the victim.