For to them Seaton was not a man of flesh and blood, lightly tossing pillows of eiderdown along a corridor, through an assemblage of wraithlike creatures. He was to them a monstrous being, constructed of something harder, denser, and tougher than any imaginable metal. A being driven by engines of unthinkable power, who stood unharmed and untouched while masses of stone, brickwork, and structural steel crashed down upon his bare head. A being who caught those falling masses of granite and concrete and hurled them irresistibly through rank after rank of flesh-and-blood men. "Let's go, Peg!" Seaton gritted. "The way's clear now, I guess--we'll show those horse-faced hippocampuses that what it takes to do things, we've got!" * * * * * Through the revolting, reeking shambles of the corpse-littered corridor they gingerly made their way. Past the scene of the battle, past intersection after intersection they retraced their course, warily and suspiciously at first. But no ambush had been laid--the hypermen were apparently only too glad to let them go in peace--and soon they were hurrying along as fast as Margaret could walk. They were soon to learn, however, that the denizens of this city of four-dimensional space had not yet given up the chase. Suddenly the yielding floor dropped away beneath their feet and they fell, or, rather, floated, easily and slowly downward. Margaret shrieked in alarm, but the man remained unmoved and calm. "'Sall right, Peg," he assured her. "We want to go clear down to the bottom of this dump, anyway, and this'll save us the time and trouble of walking down. All right; that is, if we don't sink into the floor so deep when we hit that we won't be able to get ourselves out of it. Better spread out that shield so you'll fall on it--it won't hurt you, and it may help a lot." So slowly were they falling that they had ample time in which to prepare for the landing; and, since both Seaton and Margaret were thoroughly accustomed to weightless maneuvering in free space, their metal shields were flat beneath them when they struck the lowermost floor of the citadel. Those shields were crushed, broken, warped and twisted as they were forced into the pavement by the force of the falling bodies--as would be the steel doors of a bank vault upon being driven broadside on, deep into a floor of solid concrete. But they served their purpose; they kept the bodies of the Terrestrials from sinking beyond their depth into the floor of the hyperdungeon. As they struggled to their feet, unhurt, and saw that they were in a large, cavernous room, six searchlightlike projectors came into play, enveloping them in a flood of soft, pinkish-white light. Seaton stared about him, uncomprehending, until he saw that one of the hypermen, caught accidentally in the beam, shriveled horribly and instantly into a few floating wisps of luminous substance which in a few seconds disappeared entirely.