Soon they mounted again to take the trail. Instead of riding with the other on the sorrel, the odd man swung up on Pat's back behind his master. But as Pat no longer suffered from hunger, he complacently accepted the return of the double load. Then all moved forward. Pat jogged out of the canyon, turning to the right on the desert, and moved rapidly north in the shadow of the hills. He held to his stride, and toward noon, rounding a giant ridge projecting into the desert from the hills, he saw ahead on his right, perhaps two miles distant across a basin, the mouth of another canyon. Evidently his master saw it also, and obviously it contained danger, for he jerked Pat down to a walk. Almost instantly he knew that the danger was real, for the man, sounding a sharp command to the others, brought him to a full stop. Then followed an excited discussion, and, when it ended, Pat, gripped in vague uneasiness, found himself urged forward at top speed. Yet in a dim way he knew what was wanted of him. He flung himself into a long stride and dashed across the wide basin, across the mouth of the canyon, into the shadow of the hills again. Breathless, he slackened his pace with thirty excited horses around him, mad swirling clouds of dust all about, and before him the oppressive stillness of the desert. They were safely past the danger zone. He pressed on at a slow canter. Ahead the mesa revealed numerous sand-dunes, large and small, rising into the monotonous skyline. Plunging among them, he mounted some easily, others he skirted as easily, and once, to avoid an unusually large one, he dropped down into the bed of an arroyo, traveled along its dry course, and then clambered up on the desert. But it was wearying work, and, becoming ever more aware of his double load, he began to chafe with dissatisfaction. Yet he held to his gait, hopeful of better things--he was always hopeful of better things now--until he reached another dune, larger than any as yet encountered, when once more he broke out of his stride to circle its bottom. As he did so, of his own volition he checked himself. Dead ahead he saw horses scattered about, and beyond the horses, rising limply in the noon haze, a thin column of smoke. Also, he felt both his riders stiffen. Then on the midday hush rose the crack of firearms from the direction of the camp. His master lifted a shrill voice. He felt a mighty pull at his head. He swung around like a flash. Then came the flaying of a rope and frantic urging of heels. He plunged among the surging horses, dancing and whirling excitedly, and out into the open beyond. He set his teeth grimly, and raced headlong to the south, galloping furiously, tearing blindly over the desert. He headed straight for the distant basin, straight for the mouth of the canyon, hurtling forward, struggling mightily under his double load. He did not know it, but he was speeding into a tragic crisis.