not sure how many dots i need for an effective spoiler wall
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hopefully this is enough,
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My reading of it was that John killed himself, by jumping from the attic to the entrance out of guilt for "killing" Annie. (or he hangs himself?) The clues are there from "The audio keeps going, though, for an upsettingly long time." when the audio description thing says it usually lasts only 30 seconds after the actual death. So he didn't die instantly like everyone else.