He was a big man--big, and heavy. I was under the handicap of the heavy force-field generator, which I knew I had to keep from his grasp or else I was finished. All he had to do was to smash the generator, and I'd be roasted the next second. Harwood barrelled into me, sweeping away the kitchen knife while I was still debating whether or not to use it. It went clattering into a pile of rocks in one corner of the garden, and then his fists hit me. I backed away, making sure I kept the generator out of his reach, and flicked out a few defensive gestures. His face was contorted with rage. He was almost blind with fury, and I could hardly blame him. Here I stood, threatening to wreck whatever monument of villainy it was that he had been erecting for twenty years. We closed in a tight clinch, and his fists pummelled my stomach. I drove upward and felt teeth splinter as I connected. He spat out a mouthful of blood and backed off. "Why did you have to do it?" he muttered. "Why did you ruin everything?" "You pitiful madman," I said. "For the sake of silly revenge on a world that rightfully regarded you as a crackpot, you--" His eyes blazed and he came driving in at me again. In the background, I heard the continuing buzzing of the Invaders, who hovered out of reach of my force-field, unable to help their master. And overriding the dull droning of the aliens was a steady pattern of sobbing coming from the porch. Laura. Watching her father and the man she loved fighting to the death in her front yard. Harwood grasped me in a tight bear-hug, his thick fingers reaching for the power-pack on my back. I danced away and landed a solid punch in the midsection, and he countered with a wild roundhouse that staggered me and knocked me within a few inches of the garden fence. He came lumbering after me, obviously determined to flatten me against the fence and crush the generator that way. I didn't have any way of escaping to the right or the left; I could only wait there and hope to withstand his assault. As he drew near, I tensed my legs and crouched. Then he hit me, and I pushed upward with all my strength. The fate of a whole world--and Laura and me--depended on my strength at that instant. It worked. His heavy body lifted, and he grunted in pain as I rammed upward. He went up, up, over the garden fence-- And then, to my horror, he cleared the garden fence and, with a soul-splitting cry, fell into the gaping mouth of his own vortex! I leaned against the fence, gaping--and before I could think of what to do, the vortex was gone, winked out as if it had never been! Then Laura was on the porch, white-faced, terrified. "What happened? Where's Daddy?" I ran to her side. "He's gone," I said. "Tripped and fell into the vortex, and then--"