and sometimes to keep the visions at bay , he 'd replay his escape in his head , detail by detail the crack he 'd noticed by the hinge in the bulkhead door , the sound of their car pulling away as they went out for a round of drinks , the screw with the missing head he 'd used to pry the crack open wider and wider until the rusty hinge snapped and a chunk of wood in the shape of a knife blade cracked away with it .