You know, I think it's just something that they might have CGI'd in there for effect. Because, after all, it's Hogwarts. Or, it could have been the shadow of someone going up the stairs or starting to come down, and then hearing voices and going back up so as not to disturb whoever was having the conversation downstairs. Things like that don't bother me, because they're so small and they don't impact the movie in any way.
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