One night, you and your side kick were fighting each other for some reason (you can make it up) and they injured your arm badly. Before you could do anything, they ran off and acted like nothing happened.

With your arm wounded, you could've returned to your house but instead went to the first place that came to your mind, the villain's house.

Once there, you knock on the door and a few moments later, a tired villain opens the door, his black cat under his arm. "What do you want, hero?"