DUNCAN HUNTED AROUND and found a twig and dug at the clogged muzzle, but the dirt was jammed too firmly in it and he made little progress. He dropped the twig and was hunting for another stronger one when he caught the motion in a nearby clump of brush. He watched closely for a moment and there was nothing, so he resumed the hunt for a stronger twig. He found one and started poking at the muzzle and there was another flash of motion. He twisted around. Not more than twenty feet away, a screamer sat easily on its haunches. Its tongue was lolling out and it had what looked like a grin upon its face. And there was another, just at the edge of the clump of brush where he had caught the motion first. There were others as well, he knew. He could hear them sliding through the tangle of falle