Merely this and nothing more.
Pretty interesting moment. At this point, the narrator is thinking about supernatural influence, so he calls Lenore’s name, but the only thing he hears is his echo. So, having ruled out the supernatural, which provides a lot of fodder for Poe horror, the reader can now assume that we’re going to get the other type of Poe horror, which is psychological, stemming from the mind of the main character in any given poem/short story. This line is the turning point for the narrator; he’s about to go crazy.
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