I would add that a cooler head with a gun would do the same as bolded, (though maybe a cool-headed person would yell a bit and threaten to call the police or ask for an ambulance if injured). It used to be a mark of honor for lawmen to claim they never had to unholster. Now, it's almost weird not to take action at any degree of threat. I have had my share of surprise hits, including being knocked down from behind. It's horrifying, humiliating, and terrifying. But "kill" was not my first thought upon getting up.