Who attacks a guy armed with an AR in a riot trying to flee a mob of rioters? I guess you could say he was part of the riot and should not have been there. People attack whoever they perceived as targets during a riot. Sometimes they attack the police, firefighters or medic units. Sometimes property owners that want to protect their property. Sometimes people like Reginald Denny who was a white truck driver who was almost killed in the LA riots because he was white.
Again. He should not have been there like Reginald Denny . But he was and he defended himself.