On we raced, around and around the spiral, ever upward. The sound of the riot in the pit had faded from our ears by now, and we came to the roof of the cavern, and the shaft that pierced it. On we went, the wall of the shaft on our left side now, and we hugged that wall closely as we sped up the narrow pathway. I judged that we had traversed two-thirds of the stair's length, when Lantin suddenly halted. When I turned, he held up a warning hand, listening intently. "Hear it?" he asked, in a low voice. I listened tensely, and in a moment heard the sound that had halted him. It was a rhythmic, regular thudding, and seemed to come from a point some distance above us, and across the shaft from us. "The guards!" he whispered. "Some of them are coming down the stair!" All the blood drove from my heart at the thought, for we were caught on the airy stairway without chance to advance or retreat. And every minute that I stood there in indecision, the tramping feet of the guards were nearing me. Why they were descending by the stair instead of the ropes, I could not guess, though it may have been that they had already started down the stair before the alarm from below. But whatever the reason, they were coming nearer and nearer, until finally they were directly across the shaft, coming around the down-slanting curve of the stairway toward us. My brain, momentarily stupefied by the oncoming deadly peril, again acted, and with frantic speed I unrolled the rope that was wound round my body. The low wall that protected the stair's right side was pierced at regular intervals with circular, ornamental openings, and swiftly I passed the rope through one of these and tied it securely, then tied its other end into a double loop. At once Lantin saw my purpose, and with a muttered "Good!" he set his foot in one of the loops, while I did the same with the other. Swiftly the tramping feet were coming around the curve toward us, though in the murky darkness of the shaft we could make out nothing. Feet in the loops at the rope's end, we grasped the low wall of the stair and gently swung ourselves over it. Then, hanging above the abyss, we lowered ourselves until we swung some twenty feet below the stair, floating gently back and forth at the rope's end, with nearly two miles of space below us. The marching guards came quickly around the stair's curve, and I held my breath as they passed the place where our rope was tied. If one but felt it and slashed carelessly with a knife, we would hurtle down to death on the floor of the pit, far below. But the guards passed on, and I could plainly hear the command of their leader to move faster, as they went by us. Waiting until they had progressed to the opposite side of the shaft, Lantin and I began to pull ourselves up. Slowly, toilsomely, we fought our way upward until our hands gripped the stair's rail and we were able to scramble over it onto the steps.