Still herding the prisoner before him, Ross came to the nearest door and looked within, to be faced by incomprehensible frames of metal rods and boxes. Rossa of the traders marveled and stared, but again, he realized that what he saw was not altogether strange. Part of one wall was a board on which small lights flashed and died, to flash again in winks of bright color. A mysterious object made of wire and disks hung across the back of a chair standing near-by.

The bound man lurched for the chair and fell, rolling toward the wall. Ross pushed him on until he was hidden behind one of the metal boxes. Then he made the rounds of the room, touching nothing, but studying what he could not understand. Puffs of warm air came in through grills near the floor, but the room had the same general chill as the hall outside.

Meanwhile the lights on the board had become more active, flashing on and off in complex patterns. Ross now heard a buzzing, as if a swarm of angry insects were gathered for an attack. Crouching beside his captive, Ross watched the lights, trying to discover the source of the sound.

The buzz grew shriller, almost demanding. Ross heard the tramp of heavy footgear in the corridor, and a man entered the room, crossing purposefully to the chair. He sat down and drew the wire-and-disk frame over his head. His hands moved under the lights, but Ross could not guess what he was doing.

The captive at Murdock's side tried to stir, but Ross's hand pinned him quiet. The shrill noise which had originally summoned the man at the lights was interrupted by a sharp pattern of long-and-short sounds, and his hands flew even more quickly while Ross took in every detail of the other's clothing and equipment. He was neither a shaggy tribesman nor a trader. He wore a dull-green outer garment cut in one piece to cover his arms and legs as well as his body, and his hair was so short that his round skull might have been shaven. Ross rubbed the back of his wrist across his eyes, experiencing again that dim other memory. Odd as this man looked, Murdock had seen his like before somewhere, yet the background had not been Gurdi's post on the southern river. Where and when had he, Rossa, ever been with such strange beings? And why could he not remember it all more clearly?

Boots sounded once more in the hall, and another figure strode in. This one wore furs, but he, too, was no woods hunter, Ross realized as he studied the newcomer in detail. The loose overshirt of thick fur with its hood thrown back, the high boots, and all the rest were not of any primitive fashioning. And the man had four eyes! One pair were placed normally on either side of his nose, and the other two, black-rimmed and murky, were set above on his forehead.

The fur-clad man tapped the one seated at the board. He freed his head partially from the wire cage so that they could talk together in a strange language while lights continued to flash and the buzzing died away. Ross's captive wriggled with renewed vigor and at last thrashed free a foot to kick at one of the metal installations. The resulting clang brought both men around. The one at the board tore his head cage off as he jumped to his feet, while the other brought out a gun.

Gun? One little fraction of Ross's mind wondered at his recognition of that black thing and of the danger it promised, even as he prepared for battle. He pushed his captive across the path of the man in fur and threw himself in the other direction. There was a blast to make a torment in his head as he hurled toward the door.

So intent was Ross upon escape that he did not glance behind but skidded out on his hands and knees, thus fortunately presenting a poor target to the third man coming down the hall. Ross's shoulder hit the newcomer at thigh level, and they tangled in a struggling mass which saved Ross's life as the others burst out behind them.

Ross fought grimly, his hands and feet moving in blows he was not conscious of planning. His opponent was no easy match and at last Ross was flattened, in spite of his desperate efforts. He was whirled over, his arms jerked behind him, and cold metal rings snapped about his wrists. Then he was rolled back, to lie blinking up at his enemies.