Update: Discussion has moved on to a new thread.
The load more comments links are getting annoying (at least if you're not logged in), so it's time for a new Harry Potter and the Methods of Rationality discussion thread. We're also approaching the traditional 500-comment mark, but I think that hidden comments provide more appropriate joints to carve these threads at. So as of chapter 67, this is the place to share your thoughts about Eliezer Yudkowsky's Harry Potter fanfic.
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. The fanfiction.net author page is the central author-controlled HPMOR clearinghouse with links to the RSS feed, pdf version, TV Tropes pages, fan art, and more, and AdeleneDawner has kept an archive of Author's Notes.
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:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it's fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that "Eliezer said X is true" unless you use rot13.
Two Questions/Guesses
1) Prof. Quirrell pointed out that Harry was especially vulnerable to the "Finite Incantatem" spell (to removed his transfigured armor). How does the canon mechanics of this spell work from a tactical standpoint? Is it area of effect or targeted on a per spell basis? Can a weak 1st year dispel a casting done by Headmaster Dumbledor or does caster strength play a role in its effectivity? Depending on the answers, Harry's vulnerability could be mitigated by pure strength or recursive spell depth or minor covering spells to absorb the dispelling castings. 'Just saying. :)
2) In terms of world building, I wonder if Harry is considering that he's got good evidence of living in a "matrix style" simulation with the reality glitches that is the existence of magic. It seems to me like just so many reality "cheat codes", hence Harry's inability to derive underlying principles in the operation and physics of magic. Indeed, the whole hero/quest/prophecy shtick would also count heavily towards a simulation argument.
He already tried on "computer simulation" - but discarded it when he found out how the time-turner worked.
I'm personally wondering when Harry figures out that he's actually a fictional character :)