Restricted Tool

Finders, keepers, is an unwritten law. But the gadget Clark accidentally found had a special set of rules governing its use by whom—and when!
Richard Clark loaded his shotgun. He glanced up the canyon, gray and misty under a cold dawn sky. A cotton-tail darted from a nearby bush and bounced away. Clark's gunsights followed in a weaving line after his bobbing target. Before he could draw a bead, the rabbit vanished behind a distant scrub oak. Clark stalked him quietly. He knew he'd bag this one without trouble, but any others around him would take cover at his first shot.
His boots crunched loudly on gravel. At the sound the rabbit sprang into the open and zigzagged toward a thicket. Furious at his clumsiness, Clark blasted away with both barrels. He charged up the canyon, fumbling in his parka for more shells, and crashed through dank high brush into a shadowy clearing. A soft rustling sound quickly faded.
Well, there he goes, Clark grumbled.
Something metallic glittered in a low, thorny shrub, and he bent down, curious. From a black cord caught in its branches dangled a silvery pocket flashlight. He smiled faintly as he pulled it loose. After months of testing and inspecting complicated electronic devices, he found simple gadgets amusing. He pressed a button on one end and eyed a white knob on the other. When it didn't light up, he stuffed it in a pocket, finishing reloading, and sighed, At least I bagged something.
Quite true! a voice shrilled behind him.
Clark whirled around and gasped in astonishment. Two squat dwarfish men crouched at the far side of the clearing. When he swung up his 16 gauge, two lights flashed, and it slid out of his hands. He buckled dizzily with weakness and nausea, but then an invisible force jolted him upright and motionless. He felt rigid as stone.
Who are you? Clark called out hoarsely.
They approached, jabbering in a strange tongue. Bluish dawnlight seemed to tint their scrawny bare arms and legs a deeper, ghastly blue. From weazel-shaped heads bulged enormous dark eyes which stared at him unblinkingly. As they waddled closer they puffed under the weight of heavy belts sagging with rows of odd, translucent instruments. One creature wore ear-phones. The other, his bald head sunken between his shoulders, opened a round, moist, pink-rimmed mouth and bowed stiffly.