Flicker jumped to his feet, his heart pounding audibly in his throat. Why such brilliant light, why such a slow-cycle current that he could see the intermittent off-and-on? Obviously, what he saw as an oscillation was a steady light to them. With such low light-sensitivity the aliens _had_ to have such brilliant lights. They couldn't see without them! The agonizing brilliance that sent Flicker into convulsions was merely the light necessary for them to see at all-- And comfortable seeing-light for him was to them--total darkness! * * * * * Far forward in the ship a metal door clanged. Flicker was instantly alert, nerves alive, every muscle tense. Klock was dead, he would be missed by the others. He took a quick glance around him, and removed the weapon from Klock's side, an ordinary, clumsily designed heat pistol, almost unrecognizable, but similar enough to the type of weapon Flicker knew to be serviceable. He strapped it to his side, and moved silently toward the hatchway. The lights had to go first. Flicker's body ached. His mind was reeling with fatigue, sliding momentarily into hazy attenuation, snapping back with a start. Unless he slept soon, he knew, his reactions would become dangerously slow, and hunger was now tormenting him also. Food and sleep would _have_ to take priority over the lights, no matter how dangerous. A thought flashed through his mind, and he glanced back at the alien body on the floor. Some of the blood had oozed out on the aluminum floor, forming a dark pool. The thought slid into focus, and the hunger reintensified, into a gnawing knot in his stomach; then he turned away in disgust. He just wasn't that hungry. Not yet. Quickly he stepped out into the passageway, moving in the direction of the engine sounds. The ship was silent as a tomb except for the distant throbbing of the motors. Far below him he heard the clang of metal on metal, as if a hatch had been slammed. Then dead silence again. No sign that Klock had been missed, not yet. Flicker breathed the cool darkness of the corridor for a moment, and then moved quickly to the ladder at the end of the passageway. His muscles ached, and his neck was cramped, but he felt some degree of his normal agility returning as he peered into the dark hold below, and eased himself down the ladder.