He tries to shake off the touch, but Ianto's hand tightens and John sighs and stops to turn toward him. He's pulled his sunglasses down over his eyes defensively, but it doesn't help disguise the surprised way Ianto is looking at him as if he's done something wrong. Which, probably, he has. Again.

"What?" he challenges finally. "In case you hadn't noticed, we're probably all going to imminently die so, spit it out."