couple of things. IF Zimmerman had followed instructions...........there would be no murder. They found Martin still holding his purchases in his hands when the police came. Kinda negates him attacking zimmernan or pounding him with fists. He was also on the phone (something inhis hands) to his girlfriend who told him to run , when he mentioned being followed .
New tidbit: Apparently zimmerman is well connected with the law enforcement crowd. More detail on that will be posted as it is revealed. IF true , it puts another crinkle in the situation making it even mirkier.