'Reasonable' in the eyes of the jury. Not "reasonable" in the mind of...George Zimmerman...
Uh, what?
And Martin's estate, if it was able to sue under FL law, would not get to self-define "reasonable" for Martin's actions (punching Zimmerman) either.
The question is whether or not Zimmerman acted as a reasonable man would act. If the state has probable cause that he did not, they will charge him, and a jury will make the ultimate decision.