Quirrell's dash to the scene ... indicate that they are afraid of what this experience will do to Harry.
It seems more likely to me that Quirrell's dash was primarily for the purpose of burning holes in Hogwarts. Despite leaving before Harry, and Harry stopping to pick up the twins and stopping at the library, and supposedly making a more direct route, Quirrell still failed to arrive before Harry, or for that matter, at all.
I'm not saying Quirrell is unafraid of what this experience will do to Harry, just that I don't believe Quirrell's dash is evidence of that.
Despite leaving before Harry
I think that's wrong. Here's chapter 89:
He'd felt the boy give himself over fully to the killing intention. That was when the Defense Professor had begun burning through the substance of Hogwarts, trying to reach the battle in time.
In chapter 90 Quirrell claims to have left as soon as he discovered "that Miss Granger was on the verge of death", whatever that means, but it seems clear he's lying.
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 94. The previous thread has passed 200 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, 19, 20, 21, 22.
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: