But whose "stand your ground"? Seems to me that law made Martin's actions completely lawful and Zimmerman's unlawful.
The standards in the law are pretty specific.
You decide to cut through a gated community. Gated, because they don't want people who don't live there to have access. The Neighborhood Watch guy asks you what you are doing there, and you take off running. He tries to trail you, relaying the info to Police. He gets out to try and verify what street he is on and you jack him from behind.
In the ensuing struggle, you are on top of the guy pummeling him. You get off and start walking away, but decide to come back and kick him in the head a few more times. Instead, you take a 9mm round to the chest and die...
Yep. Perfectly lawful. On Zimmerman's part.