The twins have a strong connection to one another. They sometimes develop a private "twin" language that only they understand. Golding demonstrates this connection in the characters of Sam and Eric, who do everything in tandem with one another. They have each other for support, always, something none of the other characters in the book really have.
Jack tries to get Ralph out of power after they saw the "deformed ape" that is really a silhouette of a parachute. Jack calls Ralph a coward, but the boys will not vote Ralph out of office. Jack storms off taking the hunters with him. As the remaining boys help Ralph build a fire most of them slip off to join Jack. Jack then declares himself the new leader. So that is most likely what it is foreshadowing.
Jack tries to get Ralph out of power after they saw the "deformed ape" that is really a silhouette of a parachute. Jack calls Ralph a coward, but the boys will not vote Ralph out of office. Jack storms off taking the hunters with him. As the remaining boys help Ralph build a fire most of them slip off to join Jack. Jack then declares himself the new leader. So that is most likely what it is foreshadowing.