Miss Katarina found out that her slave was leaking her secrets and was mad at him. She had no words but had to make sure that he was taught a lesson. And she had to do it herself. She threw him down and used her bare feet to trample him and stomp on his stupid head. She also crushed his mouth and his neck to send a message that she does not tolerate snitches.
Lady Artemis loves to trample guys who are not obedient. She likes to crush their heads so as to reboot their brain. She also likes to stomp and crush their faces because it is painful and to make them never forget, she likes to crush them in the balls. After she has done that, there is no slave in the world who will not do what she wants him to do.