As far as the actual shooting, hard to tell what happened before (But I've seen snippets) but from the short clip I've seen, it looks justified. Someone trying to leave the "protest" while another man swinging a skateboard at his head screaming "I'm going to *()#@$@ kill you" gets shot.
Haven't found a non-Facebook link for the video yet, I don't think you need a FB account to see it though. Obviously, naughty language.
https://www.facebook.com/watch/?v=870978280051527