Madame Marissa needed to enforce discipline in her life and she chose to do it with her hiking boots. She chose to crush and stomp his hands with her boots which she did in cruel fashion. It was a lot of fun for her and she enjoyed how he cried and how he begged her for mercy. But she was not moved by anything he did and she just ignored him.
Madame Marissa had an issue with this new slave and she felt that it was important for her to use her dirty hiking boots to torture him. That is why she went out of her way to dominate as well as degrade him with her hiking boots. The mistress sat back and had a great time as she watched him struggle to do the things that she wanted him to do.