Goddess Grazi does not like it when her slave does his own things instead of the way she has told him to do things. When her slave did this, she was pissed and she tortured him as punishment. She did not want him to do it again so she slapped him as hard as she could. She also trampled him with her feet after she had slapped for good measure.
Goddess Grazi is a quiet mistress. This guy mistook that for weakness and he tried to intimidate her. She was pissed and she showed him she was not a pushover by throwing him on the floor and slapping him as hard as she could manage with her bare feet. She trampled and crushed him and by the time she was done with him, he had newfound respect for her and he learned a lesson never to mess with people.