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somervta comments on Harry Potter and the Methods of Rationality discussion thread, part 27, chapter 98 - Less Wrong Discussion
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I'm still unconvinced about "Avada Kedavra and the Patronus Charm (2.0) cancel each other out". My interpretation of it in Azkaban is more "Harry and Quirrel magic cancel each other when they interact" than anything related specifically for those spells.
For the rest, there is a significant difference which, while it doesn't matter much in absolute, matters a lot of HPMOR, is that 11 yo can't cast Avada Kedavra, while they can cast Patronus. So you can have 1st years in Hogwarts who are "Silver Slytherin" because they can cast Patronus, but you can't have "Green Slytherin" that can cast AK in 1st year, because it's too advanced magic for them.
Slitherin --> Slytherin
The Patronus defending against the AK makes sense in terms of what we know about the two spells, as well as the evidence from Azkaban, as others have noticed. Also, the Patronus responded to Harry's desire to protect the Auror - the response of the Patronus seems more likely if it was a property of the spell rather than of the magic of the person casting the AK (weak evidence, sure).