Childermass doesn't stumble, though the sound of paper distracts him, leaving him looking back from where they came through. What that meant flits through his mind, ultimately settling on how they must still be in the book (it helps that he doubts the library has a real forest in it). Then he turns his attention back towards Lambert, poised as if about to say something—

First thought after wondering about the noise: where's the boy? But the second by far outweighs the first. England doesn't lack mountains. There are some, at varying sizes, but none that Childermass has ever bothered getting lost around, outside of roads. What England doesn't have is any like this. It catches him off-guard enough that what he meant to say dies in his throat and he's left gaping like a fool at the view.

It doesn't last long, as this is, after all, still Childermass. He isn't like to stand around staring, as much as he might want to.

"Lambert. Where are we now?"