Alternatively it could have been a way to determine the right memory charm to achieve the desired effect without using legilimency
The Potions Master was frowning thoughtfully, eyes intent. "The reaction to a False Memory Charm is hard to predict in advance, Mr. Potter, without Legilimency. The subjects do not always act as expected, when they first remember the false memories. It would have been a risky ploy. But I suppose that is one way Professor Quirrell could have done it.".
Like how in the GHD iteration we saw, she revealed that she was susceptible to believing that Snape is a Death Eater, and that it'd be hard to convince her that Harry would betray her. And, in fact, she was led to believe bad things about Snape, but not Harry:
She has been thinking of how Mr. Malfoy might be in league with Professor Snape, how he might be planning to harm her and harm Harry - imagining it for hours every day
(Dumbledore in Ch79)
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: