Mistress Gabriella values her time and when she noticed that this guy was wasting her time, she had to torture and to humiliate him so that he never messed with her again or with anyone else for that matter. That is why she chose to trample and choke him at the same time. She crushed him into a little man and he learned his lesson the hard and cruel way.
Raquel is a sexy giantess and she needed her instructions followed. When this guy did not do it, she turned on him and she shrunk him into a small and tiny man. She then trampled him and had fun making him learn that her instructions were not optional but rather were orders which he had to fulfill. He did not have a choice but to do it all. He never forgot that.