The slave already believed that his mistresses would have some mercy when they wear no shoes for a trampling session - only their stinky old socks. But that was a mistake! It's just easier to trample a face without shoes! The sisters trample the slaves face without a sign of mercy. Sometimes they take turns standing on it, sometimes they even stand on it together! In the end they take their socks off and trample his face under their bare feet too. His face must be destroyed!