I think the CNN voice-over was a little hyped up in terms of what this looked like to me. Of all the players in the thing I could see, only one of the bikers I could see had a gun, and it was pointed at the ground most of the time.
My conclusion is there was a fight between two groups of bikers. That’s pretty much it.
The guy getting his head stomped died of two pistol round looked like Jesus Delgado Rodriguez, the peace loving, non-affiliated, bike enthusiast. The film shows him attacking a Cossack from behind and then losing that fight. You can see the skinny guy who shot in the patio video running away in this video.