Sure, imagine that whoever killed Draco just did it by cutting off his legs. He would die, Dumbledore would arrive, and catch him. No way to avoid it - Dumbledore can use the time-turner to watch the murder.
The point of evading the wards isn't to ensure the success of the hit, it's to make sure that nobody hears about the death until the six-hour limit hides the murder.
Both Hermione's death and the complex setup used to kill Draco are consistent with wards that respond only to death.
Which brings up the question: has Dumbledore use his time-turner to observe who let the troll in?
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 90. The previous thread has passed 750 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.
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: