Princess Serena did not like how this loser spoke to her. He had to know he was the slave and she was his boss. She stomped him using her sneakers so as to make him do what she wanted. She did not care what he felt. All she cared about was putting him in his place and she managed to do it with pain as she stomped on him cruelly.
Princess Serena was not happy when this guy disrespected her slave. He was her slave and she was the only one allowed to humiliate him. She took this loser inside and read out his mistakes to him. She scolded him and when she was done, she humiliated him in the presence of her slave and she made her slave take a swing at him. He had to learn his lesson.