There's a yet-simpler possibility.
Slowly the boy sat up in bed, his hands momentarily fiddling beneath the covers.
He's not stupid, he knew that he would be summoned when her body disappeared, so he slept with whatever her body is transfigured next to his skin so that it wouldn't reverse itself and then removed it in that first moment. No Time-Turner use required.
Now show me your pouch."
"It's in my trunk -" Harry began.
"Severus," said the old wizard, and the Potions Master moved forward. "Check his trunk as well, every compartment."
I notice that there are no instructions to check anywhere else--such as under the covers on his bed.
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 94. The previous thread has passed 200 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.
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: