Mmm. He says
If, as an adult wizard, you find yourself incapable of using the Killing Curse, then you can simply Apparate away! Likewise if you are facing the second most perfect killing machine, a Dementor. You just Apparate away!"
"Unless, of course," Professor Quirrell said, his voice now lower and harder, "you are under the influence of an anti-Apparition jinx.
This does not immediately imply that the anti-Apparation jinx is something that can be cast quickly, or under combat conditions. Most spells seem to require line of sight; if Voldemort has to be able to see you to jinx you, he might as well cast AK. The only times we actually see anti-Apparation in action, it is applied to places - Hogwarts, Ministry of Magic, Azkaban - not individuals.
IIRC, in book 5 of canon, after the battle in the ministry, Dumbledore tells Fudge that the captured Death Eaters are in the Department of Mysteries, and that he has "bound them with an Anti-Disapparition jinx". This implies that this jinx is at the very least one that is capable of being cast easily and quickly enough to be a viable way to stop captured prisoners from escaping. (Although not necessarily under combat conditions.)
Edit: New thread posted here.
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 86. The previous thread has long passed 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.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
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: