One fact caused him no little speculation. It will be remembered that the approach of himself and Tim to the ridge was caused by the discovery of a thin column of smoke climbing into the sky from a more elevated portion than that attained by themselves or the Sioux with whom they had had the stirring encounter.
He did not forget, either, that the red men with whom they had exchanged shots, and from whom he had escaped by the narrowest chance conceivable, appeared from the opposite direction. Neither then, nor at any time since, had anything occurred to explain the meaning of the vapor that had arrested their attention when miles away.
If it had been kindled by Sioux or brother hostiles, why had they not appeared and taken a hand in the lively proceedings? Abundant time was given, and if they were there they ought to have met the fugitives at the close of their desperate chase, when they sprang from the back of Jack and dashed among the trees on foot.
It was these questions which caused the youth to suspect that the fire might have been started by his father. True, he had expressed a disbelief in this view when given by Tim, but that was before the later phase had dawned upon him.
It looked like a rash act on the part of the rancher, if he had performed it, but there might be excuse for his appealing to the signal that he had employed in a former instance to apprise his son of his location.
Speculation and guessing, however, could go on forever without result. There was but one way of learning the truth, and that was to investigate for himself.
Prudence demanded that the Sioux at the base of the ridge should be given no inkling of his intention; and, in order to prevent it, a long detour was necessary to take him out of their field of vision.
Accordingly he turned so as to follow a course parallel to the ridge, and breaking into a swift canter kept it up until, when he turned in the saddle and looked back, not the first sign of the hostiles was visible.
He was now miles distant, too far to return on foot, even had he felt inclined to abandon Jack and try it alone. He rode close to the base of the ridge, whose curving course was favorable, and facing about started back toward the point he had left after his survey of the party that held Tim Brophy a prisoner.
He did not believe there was any special danger in this, for he had only to maintain a sharp lookout to detect the Sioux, if they happened to be journeying in that direction. The broad stretch of open plain gave him every chance he could ask to turn the fleetness of Jack to the best account: and he feared no pursuit that could be made, where he was granted anything like a chance.