Mistress BlackDiamoond was tired of always coming to the aid of her friend lady Selina whenever she wanted to humiliate or dominate someone. She chose to teach her so that she could do it herself. She showed her how to do it at the expense of this loser. He had not done anything wrong. He was just at the wrong place at the wrong time and he was chosen by the mistress to demonstrate to her friend how to humiliate a loser using foot domination.