WOW is all I can come up with!
I don't care if the attacker is my age or even twice my age, I would have to meet force with force. Just what force is determined at a very distinct moment in time. Now that I do not have both upper limbs at the ready to fist fight or grapple my opponent I have limited options available. I think that Gumm gave the guy more than enough time to back off.
Brent