Rosenberg being aggressive does not give him the authority to shoot him. He has to argue he was in fear for his life. Which maybe he was, I can't really tell from the video. But people seem to think you can use a gun for whatever you want. That's not the case; carry pepper spray, people.

He flees the scene of the first shooting though--a mistake on his part. Presumably the crowd thought he was running from the scene of a crime and that's why they chased him. Also after the second and third victims were hit, which is after he got back up from the skateboard attack, he fires indiscriminately into the crowd, even though they were far away from him at this point. Also a no-no.

I doubt murder will stick but something lesser probably will. He was definitely not an ideal responsible gun owner here.