The patronus gets a boost by moving from 0 to +1. The killing curse gets a boost by moving from -1 to 0. That makes no sense. Why would the killing curse, which is powered by the exact opposite of the patronus, receive a boost in power by moving in the same direct as the Patronus which values life over death?
I parsed it as follows: the Killing Curse isn't powered by death in the same way that the Patronus draws power from life, but it does require the caster not to value the life of an opponent. Hatred enables this, but it's limited: it has to be intense, sustained hatred, and probably only hatred of a certain kind, since it takes some doing for neurologically typical humans to hate someone enough to literally want them dead. Indifference to life works just as well and lacks the limitations, but that's probably an option generally available only to, shall we say, a certain unusual personality type.
Ideology might interact with this in interesting ways, though. I don't know whether Death Eaters would count as being motivated by hate or indifference by the standards of the spell; my model of J.K. Rowling says "hate", while my model of Eliezer says "indifference".
Yes, that ideology is precisely what bothers me. Eliezer has a bone to pick with death so he declares death to be the ultimate enemy. Dementors now represent death instead of depression, patronus now uses life magic, and a spell that is based on hate is now based on emptiness. It's all twisted to make it fit the theme, and it feels forced. Especially when there's a riddle and the answer is 'Eliezer's password'.
New chapter!
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 102.
There is 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.)
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: