"Roger stooped, picked up a stone, aimed, and threw it at Henry- threw it to miss" (Chapter 4) --> however, this later foreshadows a later change to Roger's inhibitions.
Later, Roger has no hesitation in committing acts of violence against the boys when he acts as Jack's torturer on Castle Rock --> Golding's deliberate reference to a "stone" also foreshadows the rock that launched from Castle Rock to kill Piggy