Note, however, who is dead.
That is not much of a head wound: I bumped my head working on a car once and it bled far more than that. In the police station photos, there was no blood on his head at all.
The claim is that Zimmerman broke his nose. It does not appear to be broken.
Perhaps the trial will clarify this.
It is clear to me that Zimmerman is no hero. Just a guy that had to learn the hard way not to pack a gun and go looking for trouble.
As the song goes,
"Don't take yer guns to town, Bill, leave them guns at home Bill, don't take them guns to town."