No, I don't suppose I would.
But what COULD you do? If there's a substantial size discrepancy with the BG being the big one, what do you do in a situation like that? Mace him?
How many punches to the face do you have to absorb before you DO shoot the guy? Or, if he's winning, do you just let him pummel you unconscious, take your gun, and run? The whole topic got started by talking about a large perp saying he's gonna kick the cops ass and not stopping when told to stop, and a smaller officer who would be obviously outmatched in a fist fight. I can still see shooting the guy.