After exchanging a few words with Draco, Narcissa slipped back into the lecture hall under the pretense of looking for her husband.
She instead found a well-dressed young man keeping a wary eye on the departing crowd. How very interesting.
"I don't recall having seen you here before," she said pleasantly, though she looked a bit like a cat pondering the amusement value of a small rodent. "Belby, is it?"