Pan-at-lee hovered about, breathless, her dagger ready, but there was no opening that did not also endanger Tarzan, so constantly were the two duelists changing their positions. Tarzan felt the tail slowly but surely insinuating itself about his neck though he had drawn his head down between the muscles of his shoulders in an effort to protect this vulnerable part. The battle seemed to be going against him for the giant beast against which he strove would have been a fair match in weight and strength for Bolgani, the gorilla. And knowing this he suddenly exerted a single super-human effort, thrust far apart the giant hands and with the swiftness of a striking snake buried his fangs in the jugular of the Tor-o-don. At the same instant the creature's tail coiled about his own throat and then commenced a battle royal of turning and twisting bodies as each sought to dislodge the fatal hold of the other, but the acts of the ape-man were guided by a human brain and thus it was that the rolling bodies rolled in the direction that Tarzan wished--toward the edge of the recess. The choking tail had shut the air from his lungs, he knew that his gasping lips were parted and his tongue protruding; and now his brain reeled and his sight grew dim; but not before he reached his goal and a quick hand shot out to seize the knife that now lay within reach as the two bodies tottered perilously upon the brink of the chasm. With all his remaining strength the ape-man drove home the blade--once, twice, thrice, and then all went black before him as he felt himself, still in the clutches of the Tor-o-don, topple from the recess. Fortunate it was for Tarzan that Pan-at-lee had not obeyed his injunction to make good her escape while he engaged the Tor-o-don, for it was to this fact that he owed his life. Close beside the struggling forms during the brief moments of the terrific climax she had realized every detail of the danger to Tarzan with which the emergency was fraught and as she saw the two rolling over the outer edge of the niche she seized the ape-man by an ankle at the same time throwing herself prone upon the rocky floor. The muscles of the Tor-o-don relaxed in death with the last thrust of Tarzan's knife and with its hold upon the ape-man released it shot from sight into the gorge below.