There are completely different mechanics in a slap though. With a punch you have different delivery options (looping vs linear vs uppercut etc) all of which aff

There are completely different mechanics in a slap though. With a punch you have different delivery options (looping vs linear vs uppercut etc) all of which affect the way in which the force is generated. With a slap you're pretty limited. That said, getting slapped has a psychological effect you don't get from a punch, which can be exactly what you want.