Kurloz keeps breathing loudly, dazedly turning to focus on Murdoc, at first not understanding what the professor's asking. He defeated the boggart, didn't he? He showed he wasn't a slave to his fears... right?

Then he feels the lingering buzzing sensation in his throat from using his vocal chords for the first time in over a year.

His eyes widen with horror and his hand flies to his mouth, a choked noise escaping his lips. He begins to tremble all over as he shakes his head, denying what he'd done - what promise he'd broken. He begins to feel sick, ready to retch and potentially have a second encounter with his lunch, slowly beginning to hyperventilate. He lets out a panicked moan and works his jaw, determinedly putting his tongue between his teeth, eyes screwing closed with focus as he tries to bite through the thick organ again.