“Yes, when he turns around and attacks the other person.”
As somebody has pointed out, under Florida law, the person who strikes first is not necessarily considered the aggressor. It’s the person who is initiating contact and we know that was Zimmerman. His call explicitly says that he’s going to make contact, because Martin is trying to get away.
“Neither is an aggressor in your statement. Until one of them does something to the other, physical or intimidating, then neither is an aggressor.”
Actually, under Florida law, you are incorrect. By getting out of his vehicle and going after Martin, we know that Zimmerman initiated contact.
If Zimmerman had stayed in his vehicle or kept his distance, we know by Martin’s behaviour, that he was trying to get away, he would have kept trying to get away, which means there would have been no physical contact.
"unlawful threat by word or act to do violence to the person of another, coupled with an apparent ability to do so, and doing some act which creates a well-founded fear in such other person that such violence is imminent.
Zimmerman getting out of his car is not an act of violence nor is it a threat or an act that creates well-founded fear.