In the chapter, "Beast from the Air," Jack interrupts Piggy, and when the larger boy insists it is his turn to talk because he has the conch, Merridew counters:
"Conch! Conch! [...] We don't need the conch anymore. We know who ought to say things. [...] It's time some people knew they've got to keep quiet and leave deciding things to the rest of us" (102).
Ralph immediately responds to Jack's challenge of the conch's authority, and through it, his own. He orders Jack to sit down and be quiet, but Jack's challenge resonates with the other boys who "watched intently" to see how Ralph responds to Jack's mutinous suggestion (102). Jack's earlier respect for rules and authority has begun to dwindle to non-existence, and his dismissal of the conch's value is another tell-tale sign of his descent into savagery.