You have a 9mm and you're chasing the guy? Sorry, that's not self-defense
"Florida’s self-defense law could hamper efforts to prosecute Trayvon Martin shooter. The 2005 “Stand Your Ground” law eliminated a citizen’s duty to retreat..."
It's not 'self-defense' if you're chasing the 'bad guy' with a 9mm in your hand. Your life was not in danger. That's murder one. Sorry George.