Lady Shay needed some things but she could not count on this employee. So she felt that she needed to do something to get him to cooperate and be someone who could be counted on. The mistress crushed him with her feet before she had him lick the same feet and suck her toes. She then went ahead to make him understand that he had to change and he did.
Lady Shay was out to dominate this loser and she felt it had to be something he had never felt before. That is why the mistress chose to trample him as well as make him lick and smell her sneakers. It was cruel and painful for him but that is what she wanted and that is what ended up happening. She had a great time and knew she would do it again.