It seemed they were about ready to move. All they needed was for Diarmuid to open the door, and then they'd place their keys and, he assumed, move underground. Given the shape of the hallways, he didn't think they'd have much problem detecting when it would be good to move.

"Stay out of sight," he said shortly, his voice low. "If they find out we're here now, there'll be more we'll have to get through later."

They already had the disadvantage of not knowing exactly where the captives were. In order to make it as easy as possible for all of them, they needed to be quiet and hidden.