What’s the authors purpose in adding the parachutist to the story? LOTF

Samneric describe it as a "beast," but Golding's opening description, which follows the parachutist as he drifts across the island-as well as the wing-like quality of his torn parachute-implies that he is more akin to a fallen angel. In Judeo-Christian mythology the first fallen angel was Lucifer, who later became Satan, the incarnation of evil. The parachutist thus serves as a symbol of, and motivation for, the evil that is now manifesting on the island.

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