The smirk fell from his lips only to be replaced by a small scowl as the doctor read out loud what her files said about him. This has definitely got to be a joke.

His voice was calm and cold as he spoke. “I do not believe that I am a person named ‘Yazoo.’ My name is Yazoo, I do have two brothers, and I could do magic.” He didn't lie about his powers being gone because he figured there was no point to it. The doctor would only figure the lie out if she asked him to demonstrate them for her.