Kitty gestures impatiently. "First off, of course I've never seen summoning pentacles before. And second - I'm not asking what the runes and bands and all that are for. I'm asking why they're needed at all."

She studies him then, frowning. There's absolutely no chance that this is going to work - but it strikes her, suddenly, that also, it might. And if it does, then what? Back home, she'd been trying to think of ways to get in touch with Bartimaeus again, and - well, that must have been her solution; learn magic. Well, here he is, in front of her, with everything he knows and all his history and experience, and she might be about to just send him away again.

Not that it matters. Not really. She's not going home again. That much has been made clear. Any knowledge she gains here isn't something she can use to affect things back home. So it doesn't really matter. But. She chews on her lip a moment - then does as he says, and draws the circle according to his directions.