This is Part 2 of the discussion of Alicorn's Twilight fanfic Luminosity.
LATE BREAKING EDIT: Part 3 exists now, so new comment threads should be started there rather than here.
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website.
Here is Part 1 of the discussion. Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
The fic is really really good but there is a twist part way through that makes the fic even more worth reading than it already was, but that makes it hard to talk about because to even ask if someone is twist-aware with any specific hints is difficult. The twist is in the latter half of the story. If you are certainly not post-twist and want to save the surprise, then you should stop reading here and fall back to Part 1 discussion or to the fic itself.
If you think you're pretty sure you are post-twist and are safe to read the rest of this, try reading this rot13'ed hint and see if what you've read matches this high level description of the twist...
Rqjneq unf qvfpbirerq gur frperg gung Vfnoryyn jnf xrrcvat sebz uvz "sbe uvf bja tbbq" bhg bs srne bs Neb ernqvat Rqjneq'f zvaq. Va gur nsgrezngu, fbzrguvat unf punatrq nobhg gurve eryngvbafuvc gung znl unir pnhfrq lbh gb pel sbe n juvyr, naq juvpu znlor urycf gb rzbgvbanyyl qevir ubzr gur pbzovarq zrffntr bs YJ'f negvpyrf nobhg "fbzrguvat gb cebgrpg" naq "ernfba nf n zrzrgvp vzzhar qvfbeqre" naq gur jnl gurl pna fvzhygnarbhfyl nccyl gb crbcyr jub unir abguvat zber va gur jbeyq guna fbzr fvatyr crefba jub gurl ybir.
If the answer to the hint is obvious, then just to be sure that there is not a double illusion of transparency at work, here is the cutoff point spelled out explicitly:
Gur phgbss cbvag sbe cbfgvat urer vf gung lbh unir ernq hc gb puncgre svsgl svir (va gur snasvpgvba irefvba) be puncgre gjragl rvtug ba Nyvpbea'f jrofvgr jurer Rqjneq jnf cebonoyl vapvarengrq, Vfnoryyn fheivirf na nggrzcgrq vapvarengvba, naq fur unf gb ortha gb jbex bhg jung gb qb jvgu gur jerpxntr bs gur erfg bs ure "rgreany" yvsr.
The only causes for her reaction at the end of chapter I can come up with are as follows.
1: She's been hit by Alec, and probably Addy has too.
2: Addy is sending all her memories to Elspeth, making her completely disoriented and "alone" with Addy's thoughts, that she interprets as her own.
3: Addy is sending her a memory of being hit by Alec, not all her memories.
1 probably means there's a rebellion for some reason. Or, more likely; Aro has found out about Addy's sessions with Elspeth and deemed them too dangerous to continue. Alec is there to separate them and perhaps kill Elspeth to eliminate the risk of her spreading a heuristic allowing people to neutralize the effects of Chelsea's witchcraft very effectively.
2 means we get to see whether Addy really is voluntarily working for the Volturi, or if she was tempted by their powers and later enslaved by Chelsea like everyone else. If she is, then she should have been able to use Magic to neutralize the effects like Elspeth does, but maybe she isn't able to make that decision herself but would turn sides if Elspeth sends her the same heuristic she would her friends.
3 probably means Addy is testing if a memory of Alec's power is sufficient enough to keep a person subdued. If it is, then she may decide Elspeth's witchcraft can't develop any further and finally deem her uninteresting and not useful.
I hope it's something close to my second guess, so Elspeth can finally get on with freeing people from this horrible situation. And later the Volturi can hopefully get what's been a long time coming. Especially Aro, Chelsea and Addy, if she's a voluntary participant.