Mistress Khali wanted her slave not to take her for granted. So she had the slave starve for a few days. And when he wanted water, she would give him her pee to drink. He often watched as she peed and then handed him the water which he drank as he had no alternative. The poor guy got the message and he changed to avoid such punishments from the mistress.
Mistress Khali wanted to settle scores with this guy and she felt that foot worship would serve her well and that she would get what she wanted which was to make him feel pain and to dominate him as well. So she set out to use her sneakers to choke him and this was after she had trampled him. The mistress had a great time humiliating him and she knew it was effective.