Did Harry time-turn the day Hermione died, and, if so, what did he do?
Yes. When he went into the room with Hermione's body, he turned the time turner and transfigured her body into a ring while also transfiguring something else (presumably something very small) into a copy of Hermione's body. He then hid from his past self and left the room just after his past self entered. After the transfiguration wore off, the 'body' dissapeared.
Yes, but he could do all of that with a single twist.
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 116.
There is 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.)