Mistress Ariel doesn't take her slave too seriously. He loves to crack jokes, but she knows that he tries to hide his embarrasment this way. So she does what she feels best in this situation, gives him quite a few hard smack on his face. The slave can't deal with this kind of humilation very well, so he moves around and sways his head. But Mistress Ariel doesn't bother with his stupid things, she slaps him either way.