Sky wonders why this kind of thing is happening now, and here, and how he'd have taken it when he was this kid's age. If it is happening, and something isn't misfiring in his brain. This is not a normal occurrence. There's a billow of incomprehensible not-sound from the rest of the tour, steadier and less pronounced than any actual noise people are making, and he doesn't actually want to get close, be surrounded.

But the insistently helpful young man will notice if he doesn't rejoin the group, and whether anything here is real or not getting lost down here would cause a lot of trouble for a lot of people.

"I'm not afraid of bats. They're marvelous animals with an undeserved reputation. But, I'm human and I still have the reflex to flinch when things come at my head," he says conversationally, starting to catch up. He doesn't move all that fast, but he has a good excuse, the quality of the flooring here is an unknown.