Because you cannot send information back further than that. So if the troll was sent from six hours forward, you cannot tell people further back about it. Uhm. I just realized this cannot be a strict prohibition, or you could only have one time turner per six light hour radius volume.. Okay, so all that accomplishes is that you cannot send anyone back that knows about the troll...Yanking in some random member of the order of the pheonix and telling them to swap out harrys first aid kit, without being spotted, might still work.
That's information, and it is in some significant sense information about the troll. The only people with the ability to do that would be people without enough information to know it's a good idea.
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 88-89. The previous thread has 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, 17, 18.
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: