This mistress felt that her slave was too slow and she did not want to deal with him in that state. She had to dominate him and she had to make sure he learned to stop being slow. She felt that the best way to dominate as well as humiliate him was to use her faceslapping fetish and that is exactly what she did to him. He learned his lesson the hard way.
Mistress Smiley was not ok with how this guy was rude to her. She had not done anything to him and she did not like and she did not understand why he was rude to her. So she used her slaps to teach him never to do that to her ever again. The poor guy saw stars as she slapped him and he had to apologize for her to stop.