He was shot AFTER Brooks shot at the officer. That would be the key detail.
Well, there you go. Shoot a tazer and run away, that gets you a shot in the back. Good luck with that.
I'm still trying to get this straight myself. As I understand it, Garrett Rolfe is the one that was tazed and also charged with killing Brooks. Rolfe looks to be left handed then? The other cop doesn't appear to have pulled his weapon yet. It looks like Rolfe may have got both shots off before he was struck by the taser and there was a delayed action before Brooks went down? Just the way it looks to me.