My trouble with this theory is not that the dirt is lethal - after all, Harry has already decided Lucius's life is forfeit the moment he ceases to cooperate and that could happen at any time, contract or not contract, signing just means Lucius doesn't die soon - but rather that it seems like an extremely risky booby trap which could blow up (literally) the moment someone casts a finite-incantatem (which could happen anywhere by anyone for any reason), and it's actually more than a little suspicious if the ultra-high-security Gringotts meeting room where everyone is supposedly disarmed didn't involve a precaution like eliminating any transfigurations...
In canon, Thief's Downfall undoes transfigurations.
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 97. The previous thread is at nearly 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, 19, 20, 21, 22, 23, 24, 25.
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: