How does Farquhar’s “oscillation, like a vast pendulum” foreshadow a real event in the story?

The “vast pendulum” image suggests a body swinging back and forth. At the end of the story, Farquhar’s escape is revealed to be an illusion: he has been hanged, and his body swings beneath the bridge. So the oscillation foreshadows how his body will move at the end of the rope.

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