Foreshadowing devices in Lord of the Flies?

When roger pushes the boulder off the cliff at the start of the novel and at the end of the novel he pushes a boulder which KILLS Piggy.

There's also the parts in chapter 7 where Simon says to Ralph "I just think you'll get back alright-" He's foreshadowing that he dies. And in the same chapter, after the first pig-hunt-dance Roger says "You want a real pig, because you've got to kill it," to which Jack retorts "Use a littun," also foreshadowing Simon's death. At the end of chapter 8, when Simon is talking to the Lord of the Flies, there is another foreshadowing of his death. William Golding was really trying to make sure you knew Simon would die.

Fire on the Mountain, chapter 2, the big fire is foreshadowing to the end of the book, where the whole island is ablaze again.