Ugh, several points of bad logic.
His sickness could be due to the time travel (maybe sharing with an uncooperative body?),
There's nothing about Harry Potter-style time travel that causes sickness or bouts of weakness, even short ones. This is evidence against Quirrel's central mystery being long-distance time-travel.
it would explain the 'don't cross the streams' stuff with HarryxQuirrel.
It would NOT explain it! There's nothing in Harry Potter-style time travel (either canon or MOR!verse) about not touching or interacting with past versions of yourself. This is again evidence against Quirrel's mystery being long-distance time-travel, not in favor of it.
You're making false assumption based on other movies and series that have nothing to do with the rules of time-travel as established in Harry Potter!
It'd also explain his very good priors for what is going on
That's the only thing it would explain. But all your other points actually point against time-travel.
There's nothing about Harry Potter-style time travel that causes sickness or bouts of weakness, even short ones. This is evidence against Quirrel's central mystery being long-distance time-travel.
Travel often involves danger in Harry Potter; Floo ports can be unpleasant, likewise Port keys, and when apparating, one can 'splinch' oneself. Time travel with the heavily restricted Time turners is quite complex and hence possibly dangerous, as MoR has already shown. In the HP time-travel fic Eliezer recommended, each instance of multi-decade time travel dama...
Update: Discussion has moved on to a new thread.
The hiatus is over with today's publication of chapter 73, and the previous thread is approaching the 500-comment threshold, so let's start a new Harry Potter and the Methods of Rationality discussion thread. This is the place to discuss Eliezer Yudkowsky's Harry Potter fanfic and anything related to it.
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. The fanfiction.net author page is the central location for information about updates and links to HPMOR-related goodies, 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: