[Update: and now there's a fifth discussion thread, which you should probably use in preference to this one. Later update: and a sixth -- in the discussion section, which is where these threads are living for now on. Also: tag for HP threads in the main section, and tag for HP threads in the discussion section.]
The third discussion thread is above 500 comments now, just like the others, so it's time for a new one. Predecessors: one, two, three. For anyone who's been on Mars and doesn't know what this is about: it's Eliezer's remarkable Harry Potter fanfic.
Spoiler warning and helpful suggestion (copied from those in the earlier threads):
Spoiler Warning: this thread contains unrot13'd spoilers for Harry Potter and the Methods of Rationality up to the current chapter and for the original Harry Potter series. Please continue to use rot13 for spoilers to other works of fiction, or if you have insider knowledge of future chapters of Harry Potter and the Methods of Rationality.
A suggestion: mention at the top of your comment which chapter you're commenting on, or what chapter you're up to, so that people can understand the context of your comment even after more chapters have been posted. This can also help people avoid reading spoilers for a new chapter before they realize that there is a new chapter.
Harry didn't even consciously try to stop Quirrel's killing curse. It was an accident. Quirrel couldn't have counted on it happening to set Harry up.
Oh, you're quite right. Perhaps Quirrel was planning to kill the Auror to make it clear that a break-out had occurred? That way, a full check of the prison would occur and Bella's replacement would likely be found. Which in turn would mean that it was put there simply to deceive Harry into a false sense of security. When the break in is made public, Dumbledore would naturally come under suspicion (since a Dementor disappeared under his watch) and he would suspect Harry. That might also explain the lack of the 30th charm by Quirrel. Might make Harry traceable.
I could be completely wrong, of course. Pure speculation.