They rounded this precipice only to face a worse one. Shefford's nerve was sorely tried when he saw steep slants everywhere, all apparently leading down into chasms, and no place a man, let alone a horse, could put a foot with safety. Nevertheless the imperturbable Indian never slacked his pace. Always he appeared to find a way, and he never had to turn back. His winding course, however, did not now cover much distance in a straight line, and herein lay the greatest peril. Any moment Shadd and his men might come within range. Upon a particularly tedious and dangerous side of rocky hill the fugitives lost so much time that Shefford grew exceedingly alarmed. Still, they accomplished it without accident, and their pursuers did not heave in sight. Perhaps they were having trouble in a bad place. The afternoon was waning. The red sun hung low above the yellow mesa to the left, and there was a perceptible shading of light. At last Nas Ta Bega came to a place that halted him. It did not look so bad as places they had successfully passed. Yet upon closer study Shefford did not see how they were to get around the neck of the gully at their feet. Presently the Indian put the bridle over the head of his mustang and left him free. He did likewise for two more mustangs, while Lassiter and Shefford rendered a like service to theirs. Then the Indian started down, with his mustang following him. The pack-animal came next, then Fay and Nack-yal, then Lassiter and his mount, with Jane and hers next, and Shefford last. They followed the Indian, picking their steps swiftly, looking nowhere except at the stone under their feet. The right side of the chasm was rimmed, the curve at the head crossed, and then the real peril of this trap had to be faced. It was a narrow slant of ledge, doubling back parallel with the course already traversed. A sharp warning cry from Nas Ta Bega scarcely prepared Shefford for hoarse yells, and then a rattling rifle-volley from the top of the slope opposite. Bullets thudded on the cliff, whipped up red dust, and spanged and droned away. Fay Larkin screamed and staggered back against the wall. Nack-yal was hit, and with frightened snort he reared, pawed the air, and came down, pounding the stone. The mustang behind him went to his knees, sank with his head over the rim, and, slipping off, plunged into the depths. In an instant a dull crash came up.