as hard as you can, it’s probably one of the top methods one can use. Because again it’s not the word, it’s the emotion behind the word. If you need to hit someone as hard as you can like Batty needed to, the emotional release of letting go of social rules to elicit emotion is a good way to do it.
I personally have never had to hit someone like a defensive back has to while trying to come back and win, so I don’t know what tactics I’d use. If I really needed to though I don’t think I’d be choosy with my verbal tactics.