Mistress Nyx was pissed that her driver was driving carelessly. She did not want him to cause an accident and so she had to punish him and make him realize that he was accountable to her and he had to learn to do things better than he had done them that day. He was stripped naked and whipped all over his body and the pain and punishment worked as intended.
Mistress Nyx was pissed at the fact that she had an uncooperative slave. She did not expect it and had not prepared for it. That is why it pissed her off so much. But she had to find a solution for it and she did so by tying him up while he was naked and then whipping the shit out of him. He did not see it coming and regretted his actions.