But it is unblockable and precludes the target being revived in the first case or recovering their wand/grabbing someone else's/running away in the latter. In particular, HPMOR makes a very big deal out of any decent wizard being able to put up a dozen different shields, sometimes all but instantly, so unblockable spells are an extremely big deal.
In HPMOR, it also penetrates at least some thickness of cover, according to Moody, who also suggests that it does need significant mana. (How much mana? I'm getting the impression that Stupify is acceptable for Auror-level combat despite being castable by top first-years.)
It also cannot be countered. We don't see much of countering in HPMOR, but we do see Susan try to counter an extremely powerful bully's spell in the SPHEW.
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 99, 100, and 101. The previous thread is at nearly 500 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, 23, 24, 25, 26, 27
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: