Why did the Eskimos leave suddenly, before eating the dinner cooked for them by the author?

The Eskimo's had seen Mowat studdying animal feces before dinner. Since Ootek and Mike are absent, Farley acts as the host, and he offers to make them all dinner. He finishes up, cleans out the pails, and fills them with water for the tea he knows will be required. Two young Eskimos watch him with interest and then scamper up the hill to the area where the adults are setting up their tents. Farley busies himself making dinner and is stunned when the Eskimos don’t show up. He goes out to look for them and finds they have left without a word. Feeling snubbed, he later asks Ootek why they would have left in such a manner. After asking a great many questions, Ootek admits that he couldn’t possibly explain, and he doesn’t.