Simon finds the dead body of a parachutist and realizes that this is what they mistook to be the beast. Simon knows now that the beast does not exist.
Simon tells the boys the truth about the beast and now, the boys think Simon is the beast and violently maul and rip him apart to death.
The storm finally kicks up and the boys run to shelter. The body gets picked up and taken by the wind from the storm and Simon's body is taken by the sea while a halo like shape, made of phosphorescence, is floating around his head. There is now no more evidence of the beast, having the truth of the beast die with Simon.