Update: This post has also been superseded - new comments belong in the latest thread.
The second thread has now also exceeded 500 comments, so after 42 chapters of MoR it's time for a new thread.
From the first thread:
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.
Comments cover up to Chapter 46. UN-ROT13'd SPOILERS.
Love the new chapters! Harry's takedown of the Dementor was epic! Yes, I know, that term has been devalued by inflation quite a bit, but in this case its original value and meaning hold. A very nice and emotionally powerful summation of Singularitarian values in Harry's buildup. Also, I didn't stop and try to guess what Harry's Patronus would be, but "the rational animal" is the perfect choice!
One little quibble though. When Dumb-ledore and Harry were trying to guess why Quirrell might want to bring a Dementor to Hogwarts, Dumbles never bothers to mention, "Well, Quirrell did challenge me to a bet, that if any of the First Year students could produce a corporeal Patronus, that I'd let him teach the Killing Curse to anyone who was interested." Naaawwwww, there couldn't possibly be some ulterior motive to Quirrell's desire to teach Dark Magic to the kiddies, could there? Surely not!
And isn't this supposed to be an "Unforgivable" curse, as in, "life in Azkaban" or "the Dementor's Kiss" for using it? Given the existence of such a law in Wizarding society, it doesn't make sense to me for Dumbledore to allow Quirrell to teach young children something that, if used in a moment of immaturity, could completely ruin their entire lives. "The WIzengamot has decided that having a temper tantrum is not an excuse. Send for the Dementor!" Imagine a boy like Canon!Draco given the Killing Curse to use as a First Year.
On the other hand, there are other spells that could be equally lethal, like Diffendo (a cutting spell) or Fiendfyre, and those aren't "Unforgivable." I suppose the thing about Avada Kedavra is that there's no defense against it. So, while other spells might be like teaching a young kid to shoot, the Killing Curse is like giving them a rocket launcher. One that's always loaded, has unlimited ammunition, and is carried with them wherever they go. I.e., not the same thing as a young kid having a gun that they take out and use under parental supervision.
Mad-Eye/Crouch demonstrated Avada Kedavra on a spider in Book 4, and nobody had a problem with that (besides some of the students, who were appropriately shocked). I assumed that this is how Quirrelmort will teach it here.