Princess Serena did not like how lazy her slave was. She did not need the most hardworking slave in the world as she did not have a lot of work to be done by a slave, but at least she felt like she needed someone who could do a few chores here and there. To punish this slave and make him improve, she crushed his hands using her high heel boots to make him change. He did.
Madame Madison gave this slave some money to keep for her. But he lost it and when she realized, she was pissed. She had to make sure he gave her back all the money she had given him. So she trampled him using her sneakers because she wanted him to learn from the pain so as to give her the money and to make sure he was extra careful not to lose her money or other items in future.