In canon, there were two different trolls: One that got in and attacked Hermione, and one that was guarding the stone. Two totally different trolls, although many have noted that both were supplied by Quirrell. (And actually, because of this it has become fanon that Quirrell has a talent in dealing with trolls. (Although that Quirrell is a very different person from HPMOR's Hansonian Quirrell, so don't read to much into this with regards to HPMOR.))
And actually, because of this it has become fanon that Quirrell has a talent in dealing with trolls.
I believe that Quirrell actually stated this in canon. When he admitted in the chamber which held the Philosopher's Stone that he was the one who had supplied the troll for the defenses, he said he had a knack for dealing with them, or something to that effect.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 88-89. The previous thread has passed 500 comments.
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: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
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: