ikacer comments on Harry Potter and the Methods of Rationality discussion thread, part 19, chapter 88-89 - Less Wrong
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Harry should be screaming at Dumbledore to use his time-turner. There are a lot of options, constrained mostly by the necessity of seeing a Hermione-looking-thing die.
"I've already used it six times today, Harry..."
In HPMOR, time travel obeys the Novikov self-consistency principle (with the exception of liberal use of deus ex machina to keep it from being over-powered). If it were possible for Harry to use a time-turner to save Hermione, she wouldn't have died in the first place.