Apologies if this was in the earlier thread; I didn't see it.
Some facts: When Quirrell is being interrogated, he "sneezes" to cancel the spell "polyfluis reverso", which would show who, if anyone, had polyjuiced into Quirrell. Canon has it being posession, not polyjuice. Also, he suggests that someone is possessing Quirrell in a way that makes it unlikely to be believed.
Some speculation: Quirrell wants the auror to think that he's somebody else polyjuiced as Quirrell, and is willing to reveal that he is capable of powerful wandless magic to do so. He also at least partly reveals that when he messes with the room's lighting earlier. Why does Quirrell not try to hide this ability better when he knows the strategic value of hidden abilities and, IIRC, only a few wizards (Voldemort among them) are known to be capable of wandless magic?
Would it make sense for Quirrell to be Sirius Black polyjuiced? He might actually just be polyjuiced; that's why he's been so intent on helping Harry, because he's SB. He's able to do wandless magic because once he became an animagus he figured out that other wandless magic was also possible, or at least how to do this.
The new thread, discussion 13, is here.
This is a new thread to discuss Eliezer Yudkowsky's Harry Potter and the Methods of Rationality and anything related to it. With three chapters recently the previous thread has very quickly reached 1000 comments. The latest chapter as of 25th March 2012 is Ch 80.
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: one, two, three, four, five, six, seven, eight, nine, ten, eleven.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
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: