It couldn't have been Dumbledore or McGonagall or Snape, could it? Because at the time they thought of testing Harry they had already not-experienced Harry appearing in front of them at 3:00. Which itself, though, I suppose, could be a clue pointing to Harry's guilt. But maybe that's too much like "messing with time"?
I wasn't sure what time they were meeting- it seemed like it was a short time after retrieving Harry from lunch, but I couldn't find any specifics. Even if it was after three, though, they could (for example) send a Patronus to Flitwick asking where he was at three o'clock, but not to tell them anything else but that; and have Harry come there at nine, tell him to tell Flitwick not to report his arrival to anyone before nine, then Time-Turn in front of them.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 87. The previous thread has passed 500 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: