When this mistress realized that she was dealing with a stubborn slave, she knew she had to send him a message he would not forget in a hurry. So she went out of her way to dominate the guy by caging him as well as peeing on him. He could not believe what was happening to him and he begged her for mercy and he changed his ways to avoid such again.
This mistress knew that she was negotiating from a point of weakness and that she did not have much going for her. And she knew that she had to pull a rabbit out of her hat if she was going to get the contract. So she laid a trap for the main guy and she used her pee to dominate and humiliate him. She told him she would only stop if he signed the contract and he did.