I would shoot and keep shooting until I was out of bullets or they stopped moving.
Best advice I've seen. Once the threat is neutralized then the trigger finger can relax. But then what do I know, I'm just a dumb old Marine. I still subscribe to the possibly outdated notion that one shot is all you need. Plus I hate policing brass (picking up empty shell casings, for you folks in Rio Linda).
That wouldn’t be good enough if he was just playing dead.