The obvious guess is that Harry will destroy the Dementor in full view of everyone. But this seems far too obvious for Eliezer to taunt us so.
Harry knows nothing about the aurors, the Prophet reporter, Umbridge, Fenrir Greyback (if that's a correct identification), or Amelia Bones.
That leaves
The dementor he can destroy, but that's the obvious answer. Minerva he knows nothing shocking or incriminating about, and I can't think of anything that would help. Same goes for Madam Longbottom, I think.
That leaves
What could Harry say about himself that's shocking? He could confess to his role in the Azkaban breakout, but I can't see how that would help Hermione. None of his scientific knowledge or magical discoveries would impress the Wizengamot, if they could even understand him.
Does he know anything incriminating about Lucius? Well, he knows he was a Death Eater. But Harry is immune to Veritaserum and can't testify.
Is there anything he can do about or with the dementor other than destroy it, which is far too obvious?
Is there anything he can do about or with the dementor other than destroy it, which is far too obvious?
Go in front of it and let the horrible personality possess him again. After making some sort of precommitment, I suppose. This solution was foreshadowed in the omake "Lord of the rationality".
But in truth, I lost faith in Eliezer's ability to come up with realistic solutions when Harry miraculously survived the first dementor attack in Azkaban. He will probably just have Harry use his main character powers again.
EDIT: New discussion thread here.
This is a new thread to discuss Eliezer Yudkowsky's Harry Potter and the Methods of Rationality and anything related to it. With two chapters recently the previous thread has very quickly reached 500 comments. The latest chapter as of 17th March 2012 is Ch. 79.
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.
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: