Lady Karame has no time for incompetent people. And when she noticed this guy was, it was up to her to deal with him and make him stop being an incompetent fool. She cruelly used her body trampling fetish to punish him and by the time she was done with him, she had no doubt in her mind that he had learned his lesson and would not be incompetent again.
Lady Karame body trampled this guy so as to teach him a lesson. The mistress did so in order to tame him as he had become unruly. She did not want such a thing to happen again so she almost drowned him as she trampled him in water. He was so shocked and scared at what she did that he chose to change in order not to let her punish him like that again.