Mistress Lena looked like a timid person and one who could not hurt a fly. And she let a lot of people do things they should not do because she knew they stood no chance against her but they did not know that so she forgave them. But this guy went overboard and she could not keep quiet anymore. She unleashed terror on him and she made sure he suffered the consequences and that he was a lesson for the others.
Mistress Lena felt that her slave needed to be disciplined and she used her boots to do it. The mistress had been watching female domination clips and she felt that she could get a few ideas on how to go about punishing her slave. So she watched a few videos and she settled on using her feet to do it. She trampled and crushed the slave and the punishment worked.