Add that to the fact Martin had no weapon of any kind and seemed to have merely gone to the 7/11 to buy tea and candy, and there you have it.
Zimmerman did not let Martin get away ~ he went after him with a firearm. He used the firearm.
Florida law does not license folks with guns to hunt down and kill unarmed people.
That’s my general gist of the situation. The fact that Zimmerman got on the losing end of a physical situation didn’t give him the right to pull out a gun and shoot the kid.