He can hear you trying not to laugh, Trevor. Which is why Tim only smacks his shoulder with the back of his hand. This is serious.

(No, it's not. And honestly if it wasn't happening to him personally he'd probably be the same.)

'Maybe you shouldn't have cast it in the first bloody place!' Well, it turns out he can hiss too, shoulders bunching a little with it, and he feels his face heat up at how ridiculous it all looks.