Mistress Zephy could not believe that this guy was adamant over something she had told him she would handle. He was becoming a nuisance and she did not want to continue dealing with him. So she did what she had to do and she punished him using her trampling fetish. He was forced to endure the trampling and he regretted why he had pissed her off and not listened to her.
When mistress Zephy wanted to find out what this guy's pain threshold was, she had to trample him and crush him all over his body and that is what she did. She did not care what he felt as her objective was to find out how much he could take. The mistress enjoyed herself at his expense and she was able to get the info that she wanted at the end of it all.