Their progress at first was good, but as they neared the central portion of the water they were swept many yards downstream for one that they made in a transverse direction. Twice they missed projecting rocks by the narrowest margin, and then something like an exceedingly thin and exceedingly strong arm caught Anthony around the shoulders. It tugged back, stopped all their forward progress, and let them sweep rapidly down the stream and back toward the shore. Turning his head he caught a glimpse of Nash sitting calmly in his saddle, holding the rope in both hands--and laughing. The next instant he saw no more, for the current placed a taller rock between him and the bank. On that rock the line of the lariat caught, hooking the swimmers sharply in toward the bank. He would have cut the rope, but it would be almost impossible to get out a knife and open a blade with his teeth, still clinging to the tail of the swimming horse with one hand. He reached down through the water, pulled out the colt, and with an effort swung himself about. Close at hand he could not reach the rope, and therefore he fired not directly at the rope itself, but at the edge of the rock around which the lariat bent at a sharp angle. The splash of that bullet from the strong face of the rock sliced the rope like a knife. It snapped free, and the brave little mustang straightened out again for the far shore. An instant more Bard swam with the revolver poised above the water, but he caught no glimpse of Nash; so he restored it with some difficulty to the holster, and gave all his attention and strength to helping the horse through the water, swimming with one hand and kicking vigorously with his feet. Perhaps they would not have made it, for now through exhaustion the ears of the mustang were drooping back. He shouted, and at the faint sound of his cheer the piebald pricked a single weary ear. He shouted again, and this time not for encouragement, but from exultation; a swerving current had caught them and was bearing them swiftly toward the desired bank. It failed them when they were almost touching bottom and swung sharply out toward the centre again, but the mustang, as though it realized that this was the last chance, fought furiously. Anthony gave the rest of his strength, and they edged through, inch by inch, and horse and man staggered up the bank and stood trembling with fatigue. Glancing back, he saw Nash in the act of throwing his lariat to the ground, wild with anger, and before he could understand the meaning of this burst of temper over a mere spoiled lariat, the gun whipped from the side of the cowboy, exploded, and the little piebald, with ears pricked sharply forward as though in vague curiosity, crumpled to the ground. The suddenness of it took all power of action from Bard for the instant. He stood staring stupidly down at the dying horse and then whirled, gun in hand, frantic with anger and grief.