He pursued the person and then shot him, he was not approached by the kid and he was told to back off by the cops. He deserves to go to jail. Not a self defense situation.
911 dispatch said that they didn't need him to get out of the car (or whatever). Not quite the same as the cops telling him to back off. Having said that, I also think Zimmerman should have backed the hell off.
I know this isn't the Martin discussion thread but having said what I did about backing off, the second the kid started bashing dude's head into the concrete he signed his own death certificate.