Not necessarily. The assault is a factor that weighs into the totality of circumstance. The question legally is whether or not the shooter thought he was in imminent danger death or great bodily harm when he fired the shot. In my opinion, he was still in danger. Say the assailant had turned his back and walked away. In that case the shooting would not be justified.
Well, if he had turned and ran, the sheriff would have probably pressed charges against the shooter but there's a good chance that a jury would have acquitted him even then. I'm pretty sure Drejka saw that guy charging him again right after he was pushed onto the concrete and then he quickly pulled the gun and shot him. I'm not even sure he ever saw the back stepping or it was after he was shot, no audio. But the sheriff called it SYG and he was the authority, the one that interviewed Drejka and the witnesses.
The state prosecutor could come back and charge Drejka but he knows he will lose that case. I will concede there ARE and will be inconsistencies with SYG, this is an old article and now their law is more pro-SYG than ever:
http://www.tampabay.com/news/public...s-some-shocking-outcomes-depending-on/1233133
You will NEVER get a conviction in this case - a while back, still in Florida, a woman had a gun pulled on her in a carjack but she was also armed and shot and killed one, then they fled and she still shot and they ruled it SYG. And don't forget in Texas, there was that guy that shot a couple of illegals that were robbing a neighbor's house right when he was on the line to the dispatcher. He went to trial and was acquitted.