It was a precaution which he never abandoned, for while the Great Enemy was most to be feared, there were other human foes and such a narrow-throated gorge as this would ideally serve them as a trap. He shortened his lope so as to be ready to whirl away as he came to the first winding between the rugged walls of the valley--but the ground was clear before him and calling up his lagging herd, he made on towards a sound of falling water ahead. It was a new sound to Alcatraz in that place, for he remembered no cataract in this gorge. But every water-course had been greatly changed since the rains began, and who could tell what alterations had occurred here? Who, indeed, could have guessed it? For as he swung about the next bend he was confronted by a sheer wall of rock over which the falling torrent of the Little Smoky was churned to white spray by projecting fragments. Far above, the side of the mountain was still marked by a raw wound where the landslide had swept, cutting deeper and deeper, until it choked the narrow ravine with an incalculable mass of sand, crushed trees, and a rubble of broken stone. It had dammed the Little Smoky, but soon topping the obstruction, the river now poured over the crest and filled the valley with a noise of rushing and shouting so caught up by echoes that Alcatraz seemed to be standing inside a whole circle of invisible waterfalls. He wondered at that sight for only an instant; then, as the meaning drove home to him, he wheeled and raced down the valley. This was the explanation of the Enemy's move towards the throat of the cañon! He passed the mares like a red streak of light, his ears flagging back and his tail swept out straight behind by the wind of his gallop. He rushed about the next turn of the cliff and saw that the race had been in vain--the Great Enemy was spurring his reeling cowpony into the mouth of the Little Smoky gap! The chestnut made his calculations without slackening his pace. The man was in the valley, but he had not yet reached that narrow throat where his lariat was of sufficient radius to cover the space between the wall of the cañon and the stream. However, he was in excellent position to maneuver for a throw in case Alcatraz tried to slip by. Therefore he now brought his pony to a slow lope, and loosening his rope, he swung the noose in a wide circle; he was ready to plunge to either side and cast the lariat.