"That sound," the Doctor answered. "Like a beast, a hungry one. Hunting, perhaps." They made good prey, out in unfamiliar territory, many of them hardly in shape for this sort of adventure. Squinting at the landscape, his hand rose, pointing into the distance. "There. I thought I saw..."

In the distance, a cat-like figure slipped from behind a rock, only to vanish again in the shadow of a glass spire. The Doctor kept his eyes towards it as he spoke. "Did you see it?"