Except it shouldn’t be a SYG case. By all accounts available and certainly what appears to have occurred by listening to the audio tapes, Zimmerman was attacked while en route back to his vehicle. At that point he was unable to retreat, which he was trying to do at the behest of the police dispatcher / 911 operator. SYG doesn’t even come into play here because he has (and you and I have) the right to defend ourselves when being attacked - nobody can take that right away, it is a God-given right and has always existed.
This really should have nothing to do with the SYG law because he wasn’t “standing his ground” in some public place, nor was he (per his side of the story) brandishing his weapon or attempting to stand his ground. The media in its zeal to damage various SYG laws made this into a SYG case...
SYG is the only way to immunize Zimmerman from the civil suits sure to follow from Sharpton, et al.