Mistress Sheela wanted to make sure that this guy stopped being rowdy. She felt that it was important for him to humiliate the guy and teach him a lesson. It had to be a lesson he had never been taught before and that is why she kicked him in the nuts. He shit himself as she did that to him as the pain was out of this world for him.
Mistress Sheela felt that this guy was an asshole and she did not want to let him get away with the things that he had done. That is why she used her ball busting fetish to deal with him. And that is why she had to teach him a lesson. He did not want to change and that was a big deal for her. So she kicked the shit out of his balls and he changed.
Goddess Sheela was not ok with how this guy misled her. He had to be punished for all that he had done. And for that, he had to be punished. The mistress did not care about any of the things he said as he had his chance and he messed it up. So she did what she does best and she cruelly ballbusted him until he cried like a baby.