They halted again at the top of the stairway to wait until the sentry had gone down, and then stole down and dodged outside the door just as the latter turned and marched back. Flattened against the wall, they waited breathlessly, while he approached nearer and nearer, and then he halted, wheeled and went on. At the same moment the two crept quickly across the area and vanished in the darkness of the sally port.