Three to a side, the Apaches advanced with the trail between them. They were carefully hidden when they caught up with the hunters. The four Tatars were grouped together; the fifth man, heavily burdened by his pack, had climbed from the saddle and was sitting on the ground, his hands busy with a flat plate which covered him from upper chest to belt. Now that he had a chance to see them closely, Travis noted the lack of expression on the broad Tatar faces. The four men were blank of eye, astride their mounts with no apparent awareness of their present surroundings. Then as one, their heads swung around to the helmeted leader before they dismounted and stood motionless for a long moment in a way which reminded Travis of the coyotes' attitude when they endeavored to pass some message to him. But these men even lacked the signs of thinking intelligence the animals had. The helmeted man's hand moved across his chest plate, and instantly his followers came into a measure of life. One put his hand to his forehead with an odd, half-dazed gesture. Another half crouched, his lips wrinkling back in a snarl. And the leader, watching him, laughed. Then he snapped an order, his hand poised over his control plate. One of the four took the horse reins, made the mounts fast to near-by bushes. Then as one they began to walk forward, the Red bringing up the rear several paces behind the nearest Tatar. They were going upslope to the crest of a small ridge. The Tatar who first reached the crest put his hands to cup his mouth, sent a ringing cry southward, and the faint "hu-hu-hu" echoed on and on through the hills. Either Menlik had reached the camp in time, or his people were not to be so easily enticed. For though the hunters waited for a long time, there was no answer to that hail. At last the helmeted man called his captives, bringing them sullenly down to mount and ride again--a move which suited the Apaches. They could not tell how close was the communication between the rider and the helicopter. And they were still too near the plains to attack unless it was necessary for their own protection. Travis dropped back to join Nolan. "He controls them by that plate on his chest," he said. "If we would take them, we must get at that--" "These Tatars use lariats in fighting. Did they not rope you as a calf is roped for branding? Then why do they not so take this Red, binding his arms to his sides?" The suspicion in Nolan's voice was plain. "Perhaps in them is some conditioned control making it so that they cannot attack their rulers--" "I do not like this matter of machines which can play this way and that with minds and bodies!" flared Nolan. "A man should only _use_ a weapon, not be one!"