"Oh, I can certainly teach other people to scry," Strange responds, with a little shrug. If he can teach Yuya how to make a barrier spell, of course he can teach other people how to scry.

"In fact, I can teach the two of you right now if you wish. I'll just need a bowl and a clear liquid—preferably water, but spirits will do in a pinch."

You want magical theory, guess what Syr, you're getting so much magical theory.