Owen had figured that the woman was a lunatic who had guessed dcoredftly with the book. Just telling him one vague thing was not enough for him to understand how to move things with his mind. It wasn't like he could think about a ham sandwich and one would appear as commanded. That was not how the world worked. 

Then the cup moved. He knew it moved since he hadn't left his chair since he sat down earlier. It might have been nothing but it felt like he had done it. He had wanted the cup closer but now it had spilled everywhere. Owen quickly cleaned it up and opened the store. He would be exhausted but at least he had a little proof.