A copy with knowledge of a Azkaban at a certain time seems forbidden from approaching/entering Azkaban at a prior time. See "Azkaban's future couldn't interact with its past, so she hadn't been able to arrive before the DMLE had gotten the message," in Ch55. The restraint isn't so much when the DMLE gets the message, it's when Azkaban sends the message. It can't send a message that affects its past.
Azkaban might be a good place to try a can of Comed-tea.
You’re right, I had forgotten that passage.
I’m still curious how it actually works. The portal she used could simply refuse to work, but how would you be prevented from simply walking in? An invisible wall you can’t walk through, or just a sequence of increasingly improbable events happen that keep stopping you?
(If Harry’s explanation of how Comed-tea is right, it probably means just that you won’t get the urge to drink it. That “or your money-back” line suggests that you can drink it without a result, presumably if you figured it out. Though the charm mig...
- 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.