This questioning time is not for the sake of hearing an answer. He can only reply with yes or no. And I don't know what to ask since he can't reply with other answer. He can't talk, and he can't write or read.
This questioning time is to make him let down his guard so I can have the element of surprise. I need to capture him and bring him to Varadis. This way, Marie and the others can test their invention on him. Once their invention work on this boy, we can assume that their invention will work on other artificial master level mage that will come.
For now, I'll ask him random questions.
"Hey, do you know that it's time for kids to take a nap?" I said. To which I can see Shirley with her palm covering her face.
The boy answer with a shake of his head. Which mean he doesn't know that kids take a nap at this time. But after that, it seems like he was curious about Shirley's reaction as he looked at her hiding location.