"Are you following him?"

You don't hear Zimmerman return to his car when the 911 dispatcher tells him" we don't need you to follow him." If you listen closely you can hear him loading his gun by the clicking sounds. He had to have already "cocked" before he started to follow Trayvon. So for him to shoot him in self defense he had to have time prep the gun and take it from wherever he was concealing it. And the autopsy stated "intermediate" not close proximity.