Princess Serena did not know how to humiliate this guy. He was elderly and he had not done anything to her. But he was old and he was a loser, and she never passed up an opportunity to humiliate a loser. So she made him lick her socks which luckily for him were not very dirty or very smelly. But it was humiliating for him nonetheless. She then sent him away.
Princess Serena was not happy with how her slave had washed her clothes and socks. She wanted to make sure he did not repeat the mistake. So she went and she took the socks and she used them to choke him a little. She wanted to scare him so that he would always do what she asked him and do it well. She told him the next punishment would be worse than that.
Miss Serena took it upon herself to punish this slave for what he had done. She did not want to go on having a slave who did not respect her authority. She used her socks to choke him and make him realize that she was the boss. She crushed his face with her feet in socks and made him beg her for mercy. She told him if he ever repeated the mistake, he would only have himself to blame.