This, many times over. I've said that since this case first became big news. The issue here is really just whether Zimmerman reasonably believed he was in grave danger. I may misunderstand the facts, but at least under the facts as I understand them, if Zimmerman has a valid self-defense defense, he would have it in virtually any state. If he doesn't, same thing. Why? Because what happened, according to Zimmerman, is that he was following Martin because he believed him (apparently unreasonably, but who knows, and it doesn't matter) to be up to no good, when Martin suddenly turned and attacked him. Zimmerman, believing his life to be in danger, fired his weapon.
I mean, it's virtually undisputed that Zimmerman and Martin were in close physical combat. This is not a case in which, say, someone flashed a knife at the defendant from twenty yards away and rushed toward the defendant, and the defendant stood his ground and shot his attacker at a distance of 5 yards. In that case, the Stand Your Ground law would matter, because it would control whether the parties have to litigate whether the defendant could have run away rather than defend himself (in my hypothetical, he might have been able to, depending on other environmental factors such as whether the defendant was in an alley where there was nowhere to run, but in Florida he wouldn't have to if he didn't want to, no matter where he was). If Zimmerman can prove that he reasonably feared for his life, then he is innocent. Whether he believed he could retreat doesn't matter. So why the eff has the media been talking about the Stand Your Ground law? I guess because it has been a problem in other Florida cases, but it's not a major deal here.