What foreshadowing does Jim give at the end of chapter 11

The theme between the struggle of good and bad is also set up most brilliantly in this chapter. While there have been hints in the book, like the hints of Long John Silver's true character, in this chapter the true nature of the pirates and their plan of mutiny, as revealed through their dialogue, clearly predicts the future conflict between the "good" and the "bad" on the boat. At the conclusion of the chapter, Jim sees a bright ominous moon and they spot land: the sides of good and evil are about to collide.