Looks like the prosecution will pin their hopes on the what appears to be a pause before the shot was fired. That's just silly being the guy was just violently blindsided. He could have been disoriented from the hit. Read this article where a judge recently threw a manslaughter charge out based on an officers fear for his life. If they threw that one out this one will be tossed for sure.
If this is not thrown out the people of the state of FL have some serious work to do on their judicial system. Here's the link
https://www.nbcnews.com/news/nbcblk/michael-drejka-charged-florida-stand-your-ground-killing-why-wasn-n900406