Nolan moved quickly with the ironsites to his eyes and Bob to his back. He tuned out Baz, listening for familiar commands, following the group to the elevator. Bob beeped and he saw a figure leaping from the darkness, without thinking he turned and drew his knife into position, stabbing it into the heart of a leaping zombie. The beast howled and then went silent, breathing heavily until it collapsed on the floor. Nolan drew out his knife and followed the rest of the group up the escalator, watching the rear out of the corner of his eye.