At first, Jack obeys the call of the conch. However, once he leaves the boys and forms his own group, he says the conch doesn't mean anything on "his" side of the island. This means that he is rejecting the authority for which the conch stands. He had agreed to abide by the authority at the beginning of the novel. Ironically he said, "we have to have lots and lots of rules". Yet, he is the first one to begin breaking the rules and eventually rejects all rules and authority in order to gain more power.