@JTT,
This isn't a Stand Your Ground case--it's garden variety self defense.
I think the flip side of the self-defense laws in Florida is that there are stiff penalties for misuse of a gun.
For instance, if Zimmerman admitting to displaying his gun before the fight with Martin began, he'd face about 10 years just for doing that. Reasons he'd face up to 30 years for a manslaughter conviction are sentencing enhancements for use of a gun, and for the killing of a minor.
So if you illegally display or illegally use your weapon in Florida, the penalties are stiff.