His blow wrenched him around. Awkward, fighting in the air-puffed suits, with only a body-weight of some thirty pounds! Coniston stumbled over the rocks. I had still scarce recovered my wits, but I avoided his outflung arms, and, stooping, tried to recover my revolver. It lay nearby. But Coniston followed my scrambling steps and fell upon me. My foot struck the weapon; it slid away and fell down a crag into a six-foot pit. We locked together, and when I rose erect he had me around the middle. His voice jangled with broken syllables in my receiver. "Do for you now, Haljan--" It was an eery combat. We swayed, shoving, kicking, wrestling. His hold around my middle shut off the Erentz circulation; the warning buzz rang in my ears to mingle with the rasp of his curses. I flung him off, and my tiny Erentz motors recovered. He staggered away, but in a great leap came at me again. I was taller, heavier and far stronger than Coniston. But I found him crafty, and where I was awkward in handling my lightness, he seemed more skilfully agile. * * * * * I became aware that we were on the twenty-foot square grid of the observatory platform. It had a low metal railing. We surged against it. I caught a dizzying glimpse of the abyss. Then it receded as we bounced the other way. And then we fell to the grid. His helmet bashed against mine, striking as though butting with the side of his head to puncture my visor-panel. His gloved fingers were trying to rip at the fabric around my throat. As we regained our feet, I flung him off, and bounded, like a diver, head-first into him. He went backward, but skilfully kept his feet, gripped me again and shoved me. I was tottering at the head of the staircase--falling. But I clutched at him. We fell some twenty or thirty feet to the next lower spider landing. The impact must have dazed us both. I recall my vague idea that we had fallen down the cliff--my Erentz motors smashed--my air shut off. Then the air came again. The roaring in my ears was stilled; my head cleared, and I found that we were on the landing--fighting. He presently broke away from me, bounded to the summit, with me after him. In the close confines of the suit I was bathed in sweat, and gasping. I had had no thought to increase the oxygen content of my air. But I sorely needed more oxygen for my laboring, pounding heart and my panting breath. I fumbled for the oxygen control-lever. I could not find it; or it would not operate. I realized I was fighting sluggishly, almost aimlessly. But so was Coniston! * * * * * It seemed dreamlike. A phantasmagoria of blows and staggering steps. A nightmare with only the horrible vision of this goggled helmet always before my eyes.