Yes, Alpo, you are completely right. I wasn't there. I was merely thinking out loud what the prosecution would have to show to strip SYG immunity from Zimmerman in this case.
Having said that, it doesn't appear hard for the prosecution to do. 2nd Degree Murder, on the other hand, would be a higher bar for the prosecution to reach and they may accept a plea-bargain before this is over.
In either case, SYG will probably not protect Zimmerman from going to jail IMHOpinion
BTW... reread line 2a in Statute 776.041 unless you willingly fail to understand the requirements of SYG. You will find it says, "exhausted every reasonable means to escape such danger," which I interpreted as Zimmerman has exhausted every reasonable means to escape such danger before shooting an unarmed assailant.
Stand-Your-Ground still includes the requirement to withdraw in the case where one provokes the confrontation, which is what Zimmerman did. Ironic isn't it? That last part probably included to appease those damned bleeding hearts who just don't have the balls to met justice most efficiently: one-man judge, jury, and executioner.