Reid smiles widely at seeing her delight. It's really the whole reason he does magic-- he's awkward interacting with people half the time, and it's something he can be confident in that makes others happy.

"Trade secret," he informs her, gathering up the cards again. He leaves her card until last, and when he takes it from her, he rests it in the palm of his hand and then waves the other hand over the top, once, smoothly, and the card disappears as his hand leaves. He holds up his empty hands, palm out, to prove he had made it disappear. "In reality, mostly a lot of sleight of hand."

Which he's clearly a lot better at than he'd been letting on while doing the trick.