Otto had made a mistake. That's one way to explain this. In an attempt to make a form of self-sustaining power, he had not only killed the love of his life, and he had permanently welded himself to a machine that had a mind of its own. He wanted to be rid of it. And so he broke his machine. In the process of doing so, he fell. He's sinking. His vision darkens and blurs, and then it's all gone. When he woke up, he couldn't see properly, and there was a blurred face above him...