The Blood-Cooling Charm was invented for the story specifically to offer a means of murder that didn't set off the wards until the point of death; furthermore, if a professor (Quirrell) cast it, the wards wouldn't trigger anyway.
Well, yes, but it had to be believable that Hermione had cast it, therefore we can assume that it would not have triggered the wards even if Quirrel had not cast it.
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 114, and also, as a special case due to the exceptionally close posting times, chapter 115.
There is 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.)