He has very good reason to suspect that Harry knows something about the prophecy. He doesn't know that Harry knows the actual wording. He may not know the actual wording himself, though I'd have thought HPMOR!Quirrell would have found a way to find it out.
He already heard it from Snape, and can reasonably expect that after Voldemort's supposed return Dumbledore&co. would share it with Harry. It doesn't sound like Snape was thrown out partway through the prophecy the way he was in canon.
New chapter, and the end is now in sight!
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 103.
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.)
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: