"Doing that." She kept a close eye on the ground ahead of them now, suspicious of its stability. Maybe it was fine, they'd only stepped on those once. At least the other parts of the ground that fell--aside from the first--were stepped on twice. They were probably perfectly safe.
Relatively.
There was a distinct rumbling in the distance. It could have been anything, of course, could have just been more things in the distance falling back into the chasm or something. "You're gonna have to say when, Doctor, I'm rubbish at counting yards."