Madame Marissa wanted to punish her slave and she did not want to trample or slap her slave because it was not threatening enough. Instead, she decided to strangle him using a plastic bag. True to her word, she scared her slave shitless as she used it to cover her his head. By the time she was done, she knew her slave would never mess with her again and he has not.
Mistress Anne was pissed off that her husband had forgotten their anniversary yet again. He had promised to change last year but he clearly had not. She knew she had to put it to bed once and for all so she sought to do something to make him remember. She had never let him know she was good at martial arts. So she surprised him with her techniques and strangled him painfully. She choked him and told him that was the price of not remembering their anniversary.