In something like this, I wouldn't stop until he stopped struggling or submitted to me by following my orders. In something like this I would hope my adrenaline and emotions of just facing a life and death situation would not take me to the point of no return.(anybody seen the ending of Greenstreet Hooligans
) but if someone pulled a gun on me and I was able to disarm and pin him giving him the beating of a lifetime I would not want to stop until he was compliant. I would no doubt want to detain him until the authorities arrive, and he is not going to be detained by getting to his feet(which could easily allow him to A. run, B. mount an offensive, C. recover his lost weapon) He is going to be detained on the ground doing as I say.