For a particularly evil flourish, Harry could have polyjuiced into Quirrell and Quirrell into Harry before returning to Mary's Place, and Quirrell can just Confundus Flitwick himself without worrying about sending any signals, while Harry rests at St. Mungo's.
No way. They must have checked Harry for polyjuice and Harry wouldn't have posed any problem for Snape in subduing.
True. And I just realized another, much easier way to handle it would be to make Harry unavailable from 9 PM until midnight for some reason that looked accidental. An attack at 8:30 by someone who looked like one of Voldy's minions that left him unconscious would work nicely.
Update: Discussion has moved on to a new thread.
After 61 chapters of Harry Potter and the Methods of Rationality and 5 discussion threads with over 500 comments each, HPMOR discussion has graduated from the main page and moved into the Less Wrong discussion section (which seems like a more appropriate location). You can post all of your insights, speculation, and, well, discussion about Eliezer Yudkowsky's Harry Potter fanfic here.
Previous threads are available under the harry_potter tag on the main page (or: one, two, three, four, five); this and future threads will be found under the discussion section tag (since there is a separate tag system for the discussion section). See also the author page for (almost) all things HPMOR, and AdeleneDawner's Author's Notes archive for one thing that the author page is missing.
As a reminder, it's useful to indicate at the start of your comment which chapter you are commenting on. Time passes but your comment stays the same.
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: