gwern comments on Harry Potter and the Methods of Rationality discussion thread, part 5 - Less Wrong
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I disagree. The existence of a Slytherin girl's time-turner was all but spelled out before, which qualifies it as not-DeM. It was difficult to remember (I didn't, until Eliezer pointed it out) because it was a minor passage from many, many chapters in advance, but that only makes it even less of an Ass Pull.
If anything is wrong with that resolution, I think it's that Snape didn't think of that possibility despite being Head of House Slytherin and a master schemer.
What was the passage?
The bit with the Slitherin girls in chapter 46.
Ah. From http://www.fanfiction.net/s/5782108/46/Harry_Potter_and_the_Methods_of_Rationality :
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