If the Florida Stand Your Ground statute is in play, then GZ was not in the wrong to be where he was when he was attacked. 776.013 (3).
http://www.leg.state.fl.us/Statutes/index.cfm?App_mode=Display_Statute&Search_String=&URL=0700-0799/0776/Sections/0776.013.html
Not a stand-your-ground case, never was. Traditional self-defense doctrine.