Recording what transpired is going to do the breh more harm than good. Without the camera, it would be easier to argue that he thought he was under attack from multiple parties. If they wanted to help, they would provide witness testimony saying they reached the same conclusion.
Brother did the right thing though. Sometimes you got to skip the letters in the alphabet and go straight to z. If a man's woman or child is attacking me and they're doing nothing to restrain then, they are the obstacle I have to deal with as they're not going to stand by and watch their wife or child get whooped.