To each their own. Pulling a gun on someone is an act of aggression, and I will respond in a similar fashion. Cowering in a ball does not guarantee you safety either, its a bad situation regardless.
Pulling a gun on somebody after they've got you down on the ground and are punching you in the face for a minute is an act of selfdefense. Logic points to that being the more likely reality than that Martin decided to physically tangle with somebody that already had a gun drawn.