"Those globes--I think they're moving in the river now." Rynch found another stone, took careful aim, and smashed a second one. "The needler has no effect on them," he reported. "Stones do--but I don't know why." They searched about them in the crevices for more ammunition, laying up a line of fist-sized rocks, while the lights gathered in, spreading farther and farther down the shores of the islet. Hume cried out suddenly, and aimed his ray tube below. The lance of its blast cut the dark as might a bolt of lightning. With a shrill squeal, a blot shadow detached from the slope immediately below them. A vile, musky scent, now mingled with the stench of burning flesh, set them coughing. "Water spider!" Hume identified. "If they are driving those out and up at...." He fumbled at his equipment belt and then tossed an object downward to disintegrate in a shower of fiery sparks. Wherever those sparks touched rock or ground they flared up in tall thin columns of fire, lighting up the nightmare on the rocks and up the ledges. Rynch fired the needler, Hume's ray tube flashed and flashed again. Things squealed, or grunted, or died silently, while clawing to reach the upper ledges. He could not be sure of the nature of some of those things. One, armed and clawed as the scavengers, was nearly as large as a water-cat. And a furry, man-legged creature, with a double-jawed head, bore also a ring of phosphorescent eyes set in a complete circle about its skull. They were alien life routed out of the water. "The lights--smash the lights!" Hume ordered. Rynch understood. The lights had driven these attackers out of the river. Put out the lights and the boiling broth of water dwellers might conceivably return to their homes. He dropped the needler, took up stones and set about the business of finishing off as many of the lights as he could. Hume fired into the crawling mass, pausing only once to send another of those flame bombs crashing to illuminate the scene. The water creatures bewildered, clumsy out of their element, were so far at his mercy. But their numbers, in spite of the piling dead, were still a dangerous threat. Rynch tore gapping holes in that line of lights. But he could see, through the mist, more floating sparks, gathering to take their places, perhaps herding before them more water things to attack. Except for those few gaps he had wrought, the islet was now completely enveloped. "Ahhhh--" Hume's voice arose in a roar of anger and defiance. He stabbed his ray down at a spot just below their ledge. A huge segmented, taloned leg kicked, caught on the edge of the stone at the level of their feet, twisted aloft again and was gone. "Up!" Hume ordered. "To the top!"