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"You've noticed, haven't you?"
Jack put down his spear and squatted.
"Well. They're frightened."
He rolled over and peered into Jack's fierce, dirty face.
"I mean the way things are. They dream. You can hear 'em. Have you been awake at night?" Jack shook his head.
"They talk and scream. The littluns. Even some of the others. As if—"
"As if it wasn't a good island."
Astonished at the interruption, they looked up at Simon's serious face.
"As if," said Simon, "the beastie, the beastie or the snake-thing, was real. Remember?" (3.58-67)
Ralph wants to build shelters, because he knows that the kids are afraid—but all Jack wants to do is hunt. Would that have helped? We know that the boys themselves are the beast, but the boys don't. Maybe building huts would have helped them feel safe enough to keep Simon alive.