Madame Marissa caught this guy stealing and she had to do something. She does not like her employees stealing and she does not employ thieves anyway. Instead of firing him, she decided to rehabilitate him. And that meant punishing him. She trampled his hands and fingers that had done the stealing. She made him endure the pain and made him associate the pain with stealing so that he would not think of doing it next time.
Miss Katarina is a hot mistress. She is a jolly one too and it is easy for people to misread her. Her slave was one of those people. He thought she was harmless because she had never humiliated or punished her before. He started getting out of hand and she would not have it. She punished him cruelly by trampling him and jumping on him. He was in pain but he was surprised as well.