If they had eaten anything in camp, there were no evidences of it.
Having reached a point from which he could survey the party without being observed, the hunter proceeded to do so.

His first feeling was of disappointment, for Motoza was not one of the three bucks, who appeared to be in middle life, and were dressed and painted similarly to that individual.

In fact, the trio were the ones seen by the youths earlier in the day, at the point where the break in the canyon occurred.
Hazletine had set out with the belief that the vagrant Sioux was the one chiefly concerned in the disappearance of Fred Greenwood.

His absence from camp confirmed that belief, while the indifferent manner of the three, and the apparent lack of subjects of discussion among them, indicated that they knew nothing of the abduction or death, as it might be, of the missing one.

Had they known of it, the guide was confident it would have been betrayed by their manner, since they could have no suspicion that they were under surveillance at that time, and therefore would act their natural selves.
What would have been the course of Hazletine had he seen Motoza, not doubting, as he did, the guilt of the miscreant?
He would have walked directly forward to the camp and warned the Sioux that if he harmed a hair of the youth's head his life should pay therefor.
Since Motoza was not in the situation thus to be warned, the hunter did the next best thing.