on 3; From chapter 6
As his hand touched the back door's handle, he heard a last whisper from behind him.
"Hermione Granger."
"What?" Harry said, his hand still on the door.
"Look for a first-year girl named Hermione Granger on the train to Hogwarts."
"Who is she?"
There was no answer, and when Harry turned around, Professor McGonagall was gone.
Seems clear to me that the whisper came from McGonagall - Harry was talking to her, Harry turned his back and heard a whisper from "her" that sounded like her. Harry thinks so to - in chapter 8 we have;
The boy's mouth was hanging open. "Were you told to wait for Harry Potter on the train to Hogwarts, or something like that?"
"No," Hermione said. "Who told you about me? "
"Professor McGonagall and I believe I see why.
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: