I read it as Snape being happy that Voldemort offered Lily an out: his deal with Voldemort must have been "please let Lily live and I'll do anything". The memory confirms the story that Voldemort gave Lily an option out ("stand aside"). So he considers Voldemort to have held up his side of the bargain.
This interpretation does not bode well for the Dumbledore-Snape alliance (which already seemed to be in bad shape in MoR)
That's how I read it as well.
Snape saw that Voldemort had kept his word, and only killed Lily when she attacked him first.
It seemed to me that Harry hadn't learned his lesson about his talks with Snape. He even noted that Snape's allegiance was wavering, and yet he shows him that Voldie given Lily her chance.
Edit: New thread posted here.
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 86. The previous thread has long passed 500 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.
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: