Ralph blows the conch under Piggy's direction and boys emerge, clearly bewildered, some naked and some in school uniforms of varying colors and styles.
The arrival of the choir is quite different from the images already created of boys randomly wandering around and having no direction. They wear a uniform and are distinct from the others.
There is drama and anticipation as ..."the creature stepped from mirage onto clear sand..." preparing the reader for something ominous and definitely foreshadowing the events that will take place later.
The choir arrives, organized and marching
approximately in step in two parallel lines
creating a totally different picture, with a clear leader (Jack) whose badge is different fro the other choir members, signifying his leadership. Jack attempts to maintain order amongst the choir boys and gets into conversation with Ralph immediately.
Piggy is intimidated by Jack, something that will hamper him throughout. Jack is self-assured and his position as "chapter chorister and head boy" adds to his arrogance, again inferring that he will play a significant role in this novel.