Thread:User talk:^demon/I replied to you, FYI/reply

Also, I'm not sure why, but it said I had one new message in Special:NewMessages. When I clicked it took me to, well, it took me to the September 17, 2013 diff of Special:Contributions/213.44.50.129. Except it's not a diff, it's a new page, I see: Thread:Extension_talk:ArchiveLinks/wikiwix/reply_(2). I assume, somehow, the 17 Sep edit triggered my new messages. Why is that?