From Season 4 Episode 6 Explained: Answers to the 5 Biggest Unsolved Questions
The mid-season turning point strips away the survivors' illusions of safety. With the protective talismans compromised, Boyd Stevens on the verge of emotional collapse, and the lighthouse functioning as an ominous siphon, the final four episodes of Season 4 must abandon defensive posturing. The townspeople can no longer wait out the night behind locked doors; their survival depends entirely on marching directly toward the source of the nightmare in the deep forest.
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from season 4 episode 6