The better you get at jiu jitsu, the less damage you'll need to do to control your opponent. Slaps can be effective to get them to open up for the submission -

The better you get at jiu jitsu, the less damage you'll need to do to control your opponent. Slaps can be effective to get them to open up for the submission - clean, no damage done, and they are forced to psychologically give up, which makes the dominance more definitive.