Mistress Jenna and mistress BlackDiamoond wanted to show these slaves that they were nothing to them. They like exceptional slaves and there was nothing exceptional about these slaves. So they humiliated them by slapping them hard and making do humiliating and degrading things to themselves. They even gave them a dildo and told them to suck it and then insert it in each other's asses. It was cruel but they did it.
Mistress Meg and her friend wanted to show this guy that being a bully does not pay. They paid him back in his own coin. They made his face red from all the slapping that he had to endure. The bully was made to cry out like a little kid and a video of the same taken to use in blackmailing him. He cried to the mistresses and told them he will not do it anymore.