Ralph has changed his perspective from being on the island, at first his position as a leader was merely a game to him. However, Ralph realizes the seriousness in the situation. Ralph is a representation of civilization and from the beginning of the novel has always been a natural leader. At this point of the novel he is almost helpless, his comrades, Piggy and Simon, were gone and he struggles to stay alive as long as possible. Ralph did begin as a good leader because he assigned roles and formed a type of mock-government in hopes of remaining civil.
hope this helps :) I haven't read the book since freshman year! Took a little research.
