Only in a glance over my shoulder did I glimpse that massacre of the serpent-creatures behind me, for I was racing on down the corridor and out of the building into the narrow street, where my friends awaited me. With a word I explained to them what had happened, and instantly we set off down the street, between the great, towering buildings of beaming blue force that lay silent and dead now in the dusky darkness, only their own flickering light and that of the vast, dim-red sun that swung in the black heavens above lighting us forward as we raced on. Behind, though, in the great building from which we had fled, were rising appalling cries, the hissing utterances of the serpent-creatures and the strange and awful cries of the things with which they battled. Now about us were rising other cries as the serpent-creatures across all the city began to rouse beneath the terrific din of the wild fight in the central building. Behind us, as we raced on down the narrow street, we saw them emerging from the buildings, gazing about, and then as we were glimpsed, fleeing toward the landing-circle where lay the ships, other cries went up and after us leapt the serpent-things from all along the street, pouring into that street from its buildings and from adjacent streets and racing after us. But a few hundred yards ahead lay the landing-circle, and as we ran on we could make out the gleaming, great shapes of the oval ships lying upon it, could discern the shape of our own awaiting ship, at the circle's edge, its door open before us. Toward that black opening, as toward some tremendous magnet, we stumbled on with the last of our strength, but close behind came the serpent-creatures in ever-increasing masses, the alarm spreading now over all the gigantic city about us, and there lay still a distance that seemed infinite between us and that open door. Then, when we were but a scant hundred feet from it, the serpent-creatures hardly more than that behind us, Korus Kan slipped, stumbled and went down. We wheeled around, reaching down to help him up, but halted even as we did so. For the serpent-creatures behind us were within yards of us now, hissing cries of triumph rising from them as they writhed toward us. Then, in the next moment, from the great, looming bulk of our ship ahead there stabbed down and over us a shaft of blinding crimson light, a narrow, deadly ray that struck the writhing masses of our pursuers and swept through them in a great, slicing curve, sending them into annihilation in dazzling bursts of light as it touched them. Those farther behind came racing on, nevertheless, but before they could reach us we had stumbled on and into the ship, and with space-doors clanging and generators suddenly droning loudly, our ship shot up into the darkness just in time to escape a dozen pale death-beams that sprang toward us from the mass of our pursuers.