After a question was recently closed the poster of said question started downvoting posts of everybody participating in the closure of his question.
Is such behavior considered appropriate? If not is there anything other users should do if such behavior is noticed?
In case anybody wonder how I could deduce what had happened, this is what I saw: Within the first 10 minutes after the question was closed each person participating in the closure had one old post downvoted. That does not look like a coincidence at all. Moreover the reputation of the person who had asked the closed question had dropped by as many points as the number of answers among the downvoted posts. (I can provide a link to the closed question if really necessary, but I think it might be better if I leave that out.)