The reference in the text doesn't state anything more than that it was a snake, not that it was a Blue Krait. We don't even get to see Harry's reaction, be it familiarity or perceiving it as novel.
The snake is described as "gleaming soft white" and "silver", which fits with the description of a patronus. And as it doesn't match the description of Quirrelmort's animagus snake "bright green and intricately banded in white and blue", it is clearly not Quirrelmort's animagus form.
While I assign a much higher probability that we just saw Drako's patronus, we can't rule out the possibility that it was someone else's patronus, including Quirrelmort, even though I see those odds as being exceptionally low.
Sorry, I thought you were implying that Harry might be deceived by Quirrell pretending to be Draco, not that you were making a comment on what we can predict about the next chapter.
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 96. The previous thread is at almost 300 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, 23, 24, .
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: