Compulsion! He remembered her plea the night before, asking his help against recapture by the machine. Now he deliberately tripped her, twisted her hands behind her back. She swayed in his hold, trying to win to her feet, paying no attention to him save as a hindrance against her answering that demanding call he could not hear. 7 "What happened?" Tsoay took a swift stride, stood over the writhing girl whose strength was now such that Travis had to exert all his efforts to control her. "I think that the machine she spoke about is holding her. She is being drawn to it out of hiding as one draws a calf on a rope." Both coyotes had arisen and were watching the struggle with interest, but there was no warning from them. Whatever called Kaydessa into such mindless and will-less answer did not touch the animals. And neither Apache felt it. So perhaps only Kaydessa's people were subject to it, as she had thought. How far away was that machine? Not too near, for otherwise the coyotes would have traced the man or men operating it. "We cannot move her," Tsoay brought the problem into the open--"unless we bind and carry her. She is one of their kind. Why not let her go to them, unless you fear she will talk." His hand went to the knife in his belt, and Travis knew what primitive impulse moved in the younger man. In the old days a captive who was likely to give trouble was efficiently eliminated. In Tsoay that memory was awake now. Travis shook his head. "She has said that others of her kin are in these hills. We must not set two wolf packs hunting us," Travis said, giving the more practical reason which might better appeal to that savage instinct for self-preservation. "But you are right, since she has tried to answer this summons, we cannot force her with us. Therefore, do you take the back trail. Tell Buck what we have discovered and have him make the necessary precautions against either these Mongol outlaws or a Red thrust over the mountains." "And you?" "I stay to discover where the outlaws hide and learn all I can of this settlement. We may have reason to need friends----" "Friends!" Tsoay spat. "The People need no friends! If we have warning, we can hold our own country! As the Pinda-lick-o-yi have discovered before." "Bows and arrows against guns and machines?" Travis inquired bitingly. "We must know more before we make any warrior boasts for the future. Tell Buck what we have discovered. Also say I will join you before," Travis calculated--"ten suns. If I do not, send no search party; the clan is too small to risk more lives for one." "And if these Reds take you--?" Travis grinned, not pleasantly. "They shall learn nothing! Can their machines sort out the thoughts of a dead man?" He did not intend his future to end as abruptly as that, but also he would not be easy meat for any Red hunting party.