This guy had betrayed mistress Dula and her friend. For that, he had to be punished and the mistresses did it painfully. The poor guy was forced to endure trampling while he was naked and when that was over, he was caged. It was a small cage where he was cramped up and in a lot of pain besides being cold. It served him right and he got the lesson.
Mistress Dula wanted this slave to know that she was not going to let him get away with the many mistakes he had done willingly. That is why she used her forced foot worship to dominate as well as humiliate him. He was in pain as she did her thing on him and he was also humiliated. But the point was home and he got it. He never repeated his mistake.