He may have done something earlier, but in the video I saw leading up to the shooting, he was hit, retreated a good distance and was then attacked. Not sure about NM law, but in many states, even if someone is an initial attacker, once they retreat, there is no justified defense against them. So the mob attacking him is pure assault by them regardless of any possibility he may have been the initial aggressor.

So, does that mean the shooter is untitled to self-defense since he was very clearly retreating?