Foreshadowing in the Lord of the Flies?

In the beginning of the book, Ralph is constantly saying that the fire is the key to being rescued and going back to civilization. Toward the end, all hopes of civilization on the island is lost and Jack sets out to hunt his prey, Ralph. While doing so he tries catching the bush Ralph is hiding in on fire. This ends up catching the whole island on fire and getting noticed by a ship, and all the boys are rescued before any harm is done to Ralph.