What is jack trying to do to the boys towards the end? How is jack trying to make the boys feel? Why?

"But didn't the Chief say why? I never heard him sitting on the tremendous in the torrid sun, Roger received this news as an illumination.He ceased to work at his tooth and still assimilating the possibilities of irresponsible authority. Then without another word, he climbed down the back of the rocks towards the cave and he rest of the tribe. The chief was sitting there, naked to the waist, his face blocked out in white and red. The tribe lay in a semicircle before him. The newly beaten and untied Wilfred was sniffing noisily in the background. Roger squatted with the rest ‘’To morrow," went on the Chief "we shall hunt again He pointed at this savage and that with his spear. "Some of you will stay here to improve the cave and defend the gate. I shall take a few hunters with me and bring back meat. The defenders of the gate will see that the others don't sneak in A savage raised his hand and the chief turned a bleak, painted face towards him. Why should they try to sneak in, Chief?" The Chief was vague but earnest. "They will. They'll try to spoil things we do. So the watchers at the gate must be careful. And then-- The Chief paused. They saw a triangle of startling pink dart out, pass along his lips and vanish again and then: the beast might try to come in. You remem ber how he crawled The semicircle shuddered and muttered in agreement. "He came disguised. He may come again even though