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Before the party had started a great log had been dragged into the center of the lawn and Jack, painted and garlanded, sat there like an idol. There were piles of meat on green leaves near him, and fruit, and coconut shells full of drink. (9.40)
Jack derives power by evoking religious authority.
[The boys] found themselves eager to take a place in this demented but partly secure society. They were glad to touch the brown backs of the fence that hemmed in the terror and made it governable. (9.86)
The boys see themselves as a fence—but this isn't the white picket fence of civilization; it's a fence of their naked bodies, getting ready to reenact their savage pig hunt—before they rip Simon to bits with their bare hands.