I watched a few reports and read an article to reacquaint myself with the case. Zimmerman was not treated for serious injuries. The EMTs did not think he was injured, or they would have rushed him to the hospital straightaway.
I don't think it was intentional murder, but definitely manslaughter. He should not have shot him. He KNEW the police were coming, he was bigger than Martin. I don't buy that he feared for his life.
It doesn't matter how serious his injuries were, what matters is that he thought he was in danger on serious bodily injury or death.
By the way..... I'm not picking on your points to be an arse.... I do want to dispel the myths that greater size is always an advantage, and that an attacker must be armed with a firearm or knife to justify deadly force..... those are myths and could be deadly to a defender if they consider it.