I do. [Rhys flicked his wand, setting the little burner beneath one of his cauldrons alight, something apparently unrelated to the tutoring session, at least for now.]

Now take out your text. I wish to see exactly how you would make a Scintillating Solution. I've already noticed that you're sloppy with your ladle work, but you're a bit better with your wand. We shall have to identify your weakest points if these lessons are to be effective.