Jack pauses, slowly stretching his arms, giving the question really good consideration. He pays more attention to it than he does to the new room, in fact.

And he... does want to see. It's not like Sinclair's going to backtrack as soon as he's gone and shimmy through the crawlspace on a whim. And Jack just has this impending sense of doom about Ryan's office. A feeling he wants to dispel before he goes in there with anyone else.

"...Good idea," he says, nodding without looking at Sinclair's face.

Now that the door is open he sets off up the stairs, not wasting any time.