They already went to Azkaban, so they can't undo that to run an errand.
I'm guessing that Eliezer forgot to tells us about the errand in the earlier narrative.
I'm guessing that Eliezer forgot to tells us about the errand in the earlier narrative.
If it turns out they did it before they left, there will be a clue in the narrative now, as Eliezer will already have used his timer turner to update the text by now. ;-)
[Edit: ...and, it turns out I'm wrong. Also, disappointed in Eliezer. This does indeed lower my credence for future cliffhangers turning out awesomely, as it's way too much of a deus ex machina here.]
- This thread has run its course. You will find newer threads in the discussion section.
Another discussion thread - the fourth - has reached the (arbitrary?) 500 comments threshold, so it's time for a new thread for Eliezer Yudkowsky's widely-praised Harry Potter fanfic.
Most of the paratext and fan-made resources are listed on Mr. LessWrong's author page. There is also AdeleneDawner's collection of most of the previously-published Author's Notes.
Older threads: one, two, three, four. By tag.
Newer threads are in the Discussion section, starting from Part 6.
Spoiler policy as suggested by Unnamed and approved by Eliezer, me, and at least three other upmodders:
It would also be quite sensible and welcome to continue the practice of declaring at the top of your post which chapters you are about to discuss, especially for newly-published ones, so that people who haven't yet seen them can stop reading in time.