My speculations were:
Maybe Lucius decided to let Draco keep some privacy.
Or he just hasn't gotten around to fully questioning him under veritaserum yet.
Or he's pretending that he doesn't know that Harry has a Patronus.
Or someone obliviated Draco of this information before Draco was returned to his father.
Or Draco is secretly an occlumens and he just pretended to let the veritaserum work on him.
I don't think Draco is an occlumens. I also don't think Lucius is such a nice dad that he would respect Draco's privacy after Draco was nearly killed.
I suppose he might not have had the chance yet, but if I was Lucius I would have tried really hard to get the chance to question Draco in detail before the trial. Unless Lucius was overconfident of his influence with the Wizengamot?
Draco knows that HJPEV claims to be able to Patronus. Draco knows that HJPEV presented himself as though he needed to hide his Patronus. Lucius knows that the 'light' side regards the ability to Patronus as a 'light' qualifier.
If Lucius also knows what Draco knows, then he would know that inviting HJPEV to Patronus would probably result in one of two things: either he learns something HJPEV may believe to be a valuable secret, or he casts doubt on HJPEV's 'light' side qualities.
it's win-win, just like you know he likes 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 81, which should be published later today. The previous thread passed 400 comments as of the time of this writing, so it will pass 500 comments soon after the next chapter is posted, if not before. I suggest refraining from commenting here until chapter 81 is posted; comment in the 12th thread until you read chapter 81. After chapter 81 is posted, I suggest all discussion of previous guesses be kept here, with links to comments in the previous thread.
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.) When posted, chapter 81 should appear here.
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: one, two, three, four, five, six, seven, eight,nine, ten, eleven, twelve.
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: