As Kathrine walks to the tunnel, she sees another torch, this time at a coner, and hears a louder 'shhhnick' coming form in front of her. After a few seconds, a bolt lances out from a small hole in the wall in front of her, about a foot under the torch, at about chest height for her. The bolt caster is obviously damaged, as the bolt hits the ceiling above her head, and bounces as it travels down the tunnel, throwing sparks around from where it hits the corridor walls.