What sign do the boys get from grown-up world?

At the end of Chapter 5, the boys lament about their situation and wish for a sign from the world of grown-ups. Ironically, the sign from the world of grown-ups is a dead paratrooper. At the beginning of Chapter 6, while the boys are sleeping, an aerial battle takes place above the island. In the midst of the battle, a paratrooper is shot down out of the sky and drifts to earth. The boys are unaware of the overhead battle that took place throughout the night and do not know that a dead paratrooper has landed on the island. Later on in the novel, Samneric spot the dead paratrooper's body swaying back and forth on the top of the mountain. Samneric mistake the paratrooper for the beast and the boys form a hunting party to track the beast. Simon is the only character to view the paratrooper and correctly identify it as a dead human body. Unfortunately, Simon is violently assaulted and dies on the beach before telling the boys the news the beast is actually a dead paratrooper.