How is being pinned to the ground and beaten a "fist fight"? How is having your head slammed against concrete a "fist fight"? What part of "..fear of death or great bodily harm" is it you don't comprehend?
The dumbass put himself in that situation by profiling Martin and trying to be a junior cop by following him. He should have never left his house in the first place. If he was concerned he should have let the police do their job and armed himself to protect his own home and family.
Sure Zimmerman was in danger when he was fighting with T.M. but the fact is that if he had not followed the kid and gotten out of his car the fight that led to the shooting never would have happened.
Zimmerman made his own bed and now he has to lie in it.