A human shape? I could not be sure. It seemed monstrous, with a bulge between its shoulders which gave a grotesque and distorted aspect to the shadow which its weaving bulk cast upon the sand. I could see the shadow clearly across three hundred feet of sand. It lengthened and shortened, as if an octopus-like ferocity had given it the power to distort itself at will, lengthening its tentacles and then whipping them back again. But it was not an octopus. It had legs and arms, and it was crushing the man in a grip of steel. I could see that now. I stared as the others were staring, their backs turned to me, their blind hatred for me blotted out by that greater horror. I suddenly realized that the shape was human. It had the head and shoulders of a man, and a torso that could twist with muscular purpose, and massive hands that could maul and maim. It threw the hapless man from it with a sudden convulsive contraction of its entire bulk. I had never seen a human being move in quite that way, but even as its violence flared its manlike aspect became more pronounced. A frightful thing happened then. The woman screamed and rushed toward the brutish maniac with her fingers splayed. The swaying figure bent, grabbed her about the waist, and lifted her high into the air. I thought for a moment he was about to crush her as he had crushed the man. But I was wrong. She was hurled to the sand, but with a violence so brutal that she went instantly limp. Then the brutal madman turned, and I saw his face. If ever monstrous cruelty and malign cunning looked out of a human countenance it looked out of the eyes that stared in my direction, remorseless in their hate. I could not tear my gaze from his face. The hate in it could be sensed, even across a blinding haze of sunlight that blotted out the sharp contours of physical things. But more than hate could be sensed. There was something tremendous about that face, as if the evil which had ravaged it had left the searing brand of Lucifer himself! For an instant the madman stood motionless, his ghastly brutality unchallenged. Then Jeff Winters started for it. Jeff had come to Mars alone and grown more solitary with every passing day. He was a brooding, ingrown man, secretive and sullen, with a streak of wildness which he usually managed to control. He went for the madman like a gigantic terrier pup, shaggy and ferocious and contemptuous of death. The big figure turned quickly, raised his arm, and brought his closed fist down on Jeff's skull. Jeff collapsed like a shattered plaster cast. His body seemed to break and splinter, and he sprawled forward on the sand. He did not get up. Frank Anders had guns on both hips, and he drew them fast. No one knew what kind of man Anders was. He hardly ever complained or made a spectacle of himself. A little guy with sandy hair and cold blue eyes, he had an accuracy of aim that did his talking for him.