FIVE HUNDRED YARDS' RANGE Percy Darrow, with the keenness that always characterised his mental apprehension, had understood enough of my strangled cry. He had not hesitated nor delayed for an explanation, but had turned track and was now running as fast as his long legs would carry him back toward the opening of the ravine. My companions stood watching him, but making no attempt either to shoot or to follow. For a moment I could not understand this, then remembered the disappearance of Perdosa. My heart jumped wildly, for the Mexican had been gone quite long enough to have cut off the assistant's escape. I could not doubt that he would pick off his man at close range as soon as the fugitive should have reached the entrance to the arroyo. There can be no question that he would have done s

