Mistress Marie felt that she needed to dominate and humiliate this loser so she did it with her sneakers. The mistress had to make sure that her loser was not just humiliated, but that he was also in pain. So she crushed his face and trampled him with her sneakers as well as with her bare feet. As he endured the pain and licked the soles, he realized she meant business and he never messed up again.