Shadd halted within two hundred yards of where Shefford lay hidden. His keen eye had caught the significance of the narrowing level before he had reached the end. He pointed and spoke. Shefford heard his voice. The others replied. They all looked up at the steep slope, down into the chasm right below them, and across into the cedars. The Piute in the rear succeeded in turning his horse, went back, and began to circle up the slope. The others entered into an argument and they became more closely grouped upon the narrow bench. Their mustangs were lean, wiry, wild, vicious, and Shefford calculated grimly upon what a stampede might mean in that position. Then Shadd turned his mustang up the slope. Like a goat he climbed. Another Indian in the rear succeeded in pivoting his steed and started back, apparently to circle round and up. The others of the gang appeared uncertain. They yelled hoarsely at Shadd, who halted on the steep slant some twenty paces above them. He spoke and made motions that evidently meant the climb was easy enough. It looked easy for him. His dark face flashed red in the rays of the sun. At this critical moment Shefford decided to fire. He meant to kill Shadd, hoping if the leader was gone the others would abandon the pursuit. The rifle wavered a little as he aimed, then grew still. He fired. Shadd never flinched. But the fiery mustang, perhaps wounded, certainly terrified, plunged down with piercing, horrid scream. Shadd fell under him. Shrill yells rent the air. Like a thunderbolt the sliding horse was upon men and animals below. A heavy shock, wild snorts, upflinging heads and hoofs, a terrible tramping, thudding, shrieking melee, then a brown, twisting, tangled mass shot down the slant over the rim! Shefford dazedly thought he saw men running. He did see plunging horses. One slipped, fell, rolled, and went into the chasm. Then up from the depths came a crash, a long, slipping roar. In another instant there was a lighter crash and a lighter sliding roar. Two horses, shaking, paralyzed with fear, were left upon the narrow level. Beyond them a couple of men were crawling along the stone. Up on the level stood the two Indians, holding down frightened horses, and staring at the fatal slope. And Shefford lay there under the cedar, in the ghastly grip of the moment, hardly comprehending that his ill-aimed shot had been a thunderbolt.