Byodoin could see in the dark, Shinji had nightvision on his camera, and Marui had... absolutely nothing. He was sitting completely blind in the dark, painting his own mental picture of what was going on in front of him based on the very loud and graphic noises issuing from the fight.

And then suddenly there was another person there speaking, who was WAY too close to him. Startled, Marui screamed at the top of his lungs, and threw his rock in Shinji's general direction.