He was not in custody. He and his fellow perp were shoving the cop back into his car. Sorry, but that kind of aggressive behavior, involving a 300 pound guy, should allow the cop to defend himself. I seriously doubt the cop could have physically restrained 2 guys simultaneously. Sad that the guy died but he chose to be the aggressor, not once (first with the store clerk), but twice. Being a thug didn't pay off here.
According to witnesses, Martin was on top of Zimmerman, raining down punches. Since it wasn't a mixed martial arts event, there was no ref to stop it. People get beaten severely like that on the street, sometimes killed.
That's not what I said, which is why I mentioned Graham v Connor. I asked if it was universal, which is not the same as saying that police are not trained to shoot "center mass" at all.
Yeah, so what? Unless you can PROVE Zimmerman initiated and or escalated the confrontation it's legally irrelevant