Gordon pauses in mid-sentence when he hears the door rattle and glances over. Hey, it's... that-kid-he-doesn't-recall-the-name-of... and he's
fogging up the glass, the way his nose is pressed to it.

"Hm. If I didn't know any better I would begin to think that my lectures were getting popular." He quips to the crowd as he opens the door. "C'mon in, kid, have a seat, we're just getting to the hard part."