What is the beast from air described in chapter 6?

The Beast from Air is the dead body of an airman, attached to a parachute, who descend to the island from an aerial battle which took place ten miles above the island. He is the proof that life is going on in the world outside. He is essentially the message from the world of adults which Ralph had wished for. Unfortunately he was a message which was misread. The body should have reinforced Ralphs message of keeping a fire going in order to get rescued, by reminding the boys of the existence of the world beyond the island. But the body was mistaken for the beast, which undermined Ralph's authority and turned the boys thoughts inwards and away from the outside world and the possibility of rescue.