The runners, it seemed, had not been observed since they had entered their safehouse. They had gone inside and stayed there. They had not departed via their van or any other vehicle. They had not climbed out through the roof and made their way across the rooftops to another location. How, then, had they escaped? Maurice circled the safehouse, stepping through the walls of the adjoining rowhouses and out to the street in front of the safehouse, then around and back to the alley. The building walls adjoining the safehouse were intact, so the runners had not simply broken into an adjoining structure and slipped away. Only one direction remained in which they could have gone, and that was down.