This slave was a know it all and that pissed off this mistress. She did not want to deal with such a person and that is why she did what she had to do. In no time, the mistress had gone out of her way to tame him and to get him to do what she wanted. He never messed up again and he learned to shut up some times.
This mistress felt that her slave was a weakling and that she needed to dominate and toughen him up. She had given him time to do it on his own but he did not do what she wanted. So the mistress had to intervene and do something about it. So she force him to lie down and she trampled and stomped on him. Slowly over the course of many days, the plan started to work.