Mistress Valentina needed to dominate this guy and degrade him and she did it. It was easy for her to do it as she was used to it. But her friend did not know how to do it and so she was doing it to show her what to do and how to do it. When she was done, she asked her friend to give it a try and she did and loved it.
Mistress Valentina had quit her job so she had no reason to fear her ex boss. She used her humiliation fetish to dominate him for what he had done to her and for what he did to his current employees. He was trampled, he was ball crushed and he was humiliated. That is how he learned his lesson and he changed how he handled people in his office. Everyone was happy about it.