In the section where Keel (Vimes) and his gang attack the unmentinable's base, PTerry describes the tourturer entering the room being naked to the waist. Keel (Vimes) then attacks him and straps him to the chair and he is unable to move. A little later on Keel (Vimes) sets fire to the base and goes back in to "help" the torturer who is still strapped to the chair. However, Swing (the unmentionable's leader) comes in and kills the man in the chair and PTerry describes the scene as the man in the chair with Blood on his shirt, but where did the shirt come from?