The fire came steadily back, and deliberately, without the least intimation of being affected by de Spain's return. It was a duel shorn of every element of equality, with an assassin at one end of the range, and a man flattened half-way up the clouds against El Capitan at the other, each determined to kill the other before he should stir one more foot. Far above, an eagle, in morning flight, soared majestically out from a jutting crag and circled again and again in front of El Capitan, while the air sang with the whining dice that two gamblers against death threw across the gulf between them. Nan, half hidden in her trough of rock, watched the great bird poise and wheel above the deadly firing, and tried to close her eyes to the figure of de Spain above her, fighting for her life and his own. She had never before seen a man shooting to kill another. The very horror of watching de Spain, at bay among the rocks, fascinated her. Since the first day they had met she had hardly seen a rifle in his hands. Realizing how slightly she had given thought to him or to his skill at that time, she saw now, spellbound, how a challenge to death, benumbing her with fear, had transformed him into a silent, pitiless foeman, fighting with a lightning-like decision that charged every motion with a fatality for his treacherous enemy. Her rifle, at his shoulder, no longer a mere mechanism, seemed in his hands something weightless, sensible, alive, a deadly part of his arm and eye and brain. There was no question, no thought of adjusting or handling or haste in his fire, but only an incredible swiftness and sureness that sent across the thin-aired chasm a stream of deadly messengers to seek a human life. She could only hope and pray, without even forming the words, that none of her blood were behind the other rifle, for she felt that, whoever was, could never escape. She tried not to look. The butt of the heating rifle lay close against the red-marked cheek she knew so well, and to the tips of the fingers every particle of the man's being was alive with strength and resource. Some strange fascination drew her senses out toward him as he knelt and threw shot after shot at the distant figure hidden on the ridge. She wanted to climb closer, to throw herself between him and the bullets meant for him. She held out her arms and clasped her hands toward him in an act of devotion. Then while she looked, breathlessly, he took his eyes an instant from the sights. "He's running!" exclaimed de Spain as the rifle butt went instantly back to his cheek. "Whoever he is, God help him now!"