Mistress Evgenia tried to give this guy a chance in order for him to change and stop being slow but he did not change. She was frustrated with him and she had to make him change. That is why she chose to use her feet to trample him. He was crushed and made to lick her feet. He was in pain and he was humiliated but he could not do anything about it.
Mistress Evgenia wanted this guy to lick her ass but he did not do it and when she insisted, he did not do it the way she wanted and so she had to punish him. The mistress felt that the guy was ignoring her and disobeying her and none of them was ok with her. So she had to do something and she chose to trample the guy with her sweaty feet.