John considered him for a moment, raising an eyebrow at the boy's response. It was interesting to him. But he didn't know Stiles well enough to know if he should be worried by the sudden random submission in the conversation or not.
As he went on to explain, Constantine nodded. "Barriers are key for a lot of magics," he explained. It was probably something Stiles already knew, but stating it was important to make sure. "And you had power over using this one? Did anyone else where you're from, or just you?"