Tim is presently at that stage reminiscent of how a cat gets when they are visibly distressed regarding certain events - but not so distressed that they feel they should get up and do something about it. It's not indifference that arrests him, at least. It's the most that Tim can allow himself to buy into the party atmosphere: peripherally, but not by much.

"Oh, and can you say it now?" He's wry, tapping at the strings of his borrowed instrument with idle directionlessness.