Final answer:
In 'Lord of the Flies', Samneric think they see the 'beast', which is actually a dead parachutist whose appearance becomes distorted by their fear and the shadows on the mountain.
Step-by-step explanation:
In William Golding's novel Lord of the Flies, Samneric, the twin boys who often act as a single entity referred to collectively, believe they have spotted the 'beast' during the night. Their sighting actually turns out to be the dead parachutist, who has landed on the island. The twins' fear and the play of shadows on the mountain create a terrifying image that causes them to rush back to camp to warn the others.