If you want to ignore this after all, I completely understand.
[He listens quietly with his chin in both hands. Do these detailed descriptions of the sleeping people mean that she saw people she knows in the black building, or is she just getting carried away with the story or trying to be clever with the white hair and asking questions? Well, whatever the case they can't be anyone Puck knows, so he's not going to dwell on it.]
"...and this time he did get an answer. The little man's mocking laughter echoed in the vast hall."
[Puck even provides a suitably eerie cackling of his own.]
"The boy looked around in the darkness, but the man was nowhere to be seen. 'Have you forgotten already, my brave, foolish boy?' came the voice again. 'You wake these people up and then you may go home to tell whoever you please. If you cannot, their fate will be yours at the first light of day.' 'But they won't wake!' said the boy. 'You who have been here for so long, you must know a way to free them! If not, at least tell me who or what did this to them, so that I may find a way to undo it.' Once again there was that terrible laughter."
[This time Puck himself thankfully doesn't laugh, although he inserts a dark chuckle at the next sentence:]
"'Indeed, I do know' - and at that, the little man took form in mid-air, where he stood as securely as if there had been an invisible floor right above the stableboy's head. He smiled an ugly, crooked smile at the boy, tipping his little hat playfully to him. 'The person who put them here, and whom you must defeat in order to break the curse is me.'"