Something in his face twitches, the ghost of a cynical squint, and John glances away again.

"Right," he says finally, then after a long moment of hesitation lifts a hand to cover Ianto's on his arm. "I've been up to the altar. Someone's already spilled a lot of blood there recently and burnt something."

So, you know, just in case Ianto thought that might be the right avenue to go down... probably not. This may also explain why John looks like he hasn't got a lot of sleep, he's been busy.