Genius. Just arrest the momentum of, say, their head while they are flying on a broomstick. Or stop their heart from beating.
Assuming that partial Charming is possible which it probably is because of the same reasons partial Transfiguration is.
I was actually thinking that the surface of the earth relative to the core rotates at 1040 miles per hour. Also that the speed of the earth relative to the sun is 67,000 miles per hour, though that could be too deadly. (Edit: Since I was curious, casting arresto momentum with the sun as a frame of reference on a 50kg person would release 22 gigajoules. IE, you'd turn them into a kinetic kill weapon with destructive force equal to 5 tons of TNT)
But you're right, arresting the momentum could be brutal in a lot of different ways.
The next discussion thread is 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 84. The previous thread has passed 500 comments. Comment in the 14th thread until you read chapter 84.
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.
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: