Why do the rules change on top of the mountain loard of the fles?

In "Lord of the Flies," the rules change on the mountain as the boys descend into savagery and abandon civilization. The mountain, initially a place of potential rescue and a symbol of order, becomes associated with fear and the unknown, particularly with the imagined "beast." As their societal structure deteriorates, the boys prioritize power and primal instincts over established rules, leading to chaos and violence. This shift highlights the theme of the inherent darkness within human nature when civilization breaks down.