"The sense vibrations, don't they?" Her voice is barely audible, and she starts easing in the direction he's indicated.

The scrape CLACK stops for a moment, and then picks up again. A behemoth of a shadow creeps out from the edge of the canyon. The silhouette of a claw catches in the moonlight, and it's easily two metres long.

"Stay calm, Alex. Just go slowly. Quietly."