Draco and Luna
Draco didn't appreciate being spoken too as if he was deliberately unhelpful. He was stuck here, and all he'd done was respond to Luna's statements. To stand in surly silence would have been rude, something Draco wasn't unless he really intended to be. Now, though, now he was perfectly willing to be rude, so he ignored Luna, going through the pockets of the nearest cloak out of sheer boredom. He wasn't going to steal anything, but maybe someone had something that could help them get out.
He watched out of the corner of his eye as Luna made a second attempt, and saw the silvery hare disappear through the door. Well, that was interesting. Presumably there were wards that would actually prevent a patonus from being sent. Or perhaps just knowing you'd been wilfully imprisoned was enough to make the required happiness impossible. Being accidentally trapped was, presumably, a very different feeling.
"You're welcome," Draco said, still bristling with irritation. He found two galleons in a pocket and shook his head over how stupid and trusting people were. He could have come in here at any point during the ball and stolen these without anyone being the wiser.