To me this comes down to being a classic self-defense and if Zimmerman was justified in using a gun to kill Martin. I will always stand by my opinion that it's absolutely ridiculous that is was justifiable for Zimmerman to kill Martin.
It's a fight. Zimmerman was getting his ass kicked. He suffered MAYBE a broken nose and only minor cuts on the back of his head (certainly doesn't seem like his head was pummeled that hard into the cement), yet he's justified in killing him. Absolutely ridiculous.
This kind of scenario happens every single day, with a lot of it being gang activity. Confrontation, fight breaks out, shots fired, someone dies. The person that does the shooting is a murder suspect and winds up in jail.
Ridiculous.