Harry Potter and the Methods of Rationality discussion thread, part 23, chapter 94

elharo

Harry Potter and the Methods of Rationality discussion thread, part 23, chapter 94 — LessWrong

Comment Permalink

Many people seem to suggest time-turner tricks for Harry to hide Hermione body. But that raises a few issues to me :

Do we have any evidence for or against the fact that the Hogwarts wards, or more generally a spell that Dumbledore could cast, would inform him of the usage of time-turner inside Hogwarts ? There is mention of "anti-time-loop ward", could there be "time-loop detecting wards" ?
Dumbledore didn't seem to check if Harry used his time-turner or not, and he didn't even ask him if he did. That's suspicious. It seems surprising that Dumbledore goes to great length to do a careful check of Harry's belonging, despite the social cost of doing so, and yet, not a single mention of the time-turner. Not even casually like the portkey. From an "outsider" point of view, it points to the fact Harry used it. Or at least, it would from many authors, but such a "oh well the NPC just didn't think about that major plot device" hand-waving doesn't seem at all to be Eliezer's way of doing things.

People have suggested that on being summoned to the Headmaster's office, Harry precommits to time-turn back and hide Hermione's body before the summons arrives. Whether that means replacing the ring or the stone or what have you.

There are several ways I can think of that Dumbledore could circumvent this:

keep Harry under observation for the next six hours, magically or otherwise
force Harry to use all six turns immediately, and then keep him under observation for six hours
check the Map (if he's the one who currently holds it; do we know at this point?)

... (read more)

4Intrism13y

1. Time-Turners are in frequent and authorized use by a fair number of students, as well as Dumbledore himself and possibly other staff members. Any such ward would be constantly triggering, for no particularly important reason. Even if one exists, I can't imagine that Dumbledore pays much attention to it. 2. Dumbledore is only looking for Hermione. There's no reason for him to be much interested in Harry's magical devices, beyond proving that they aren't Hermione. The portkey was only mentioned because it was a part of Dumbledore's body search; the Time-Turner, presumably, wasn't on his body.

1JoshuaZ13y

Regarding 2- possible explanations. First, it is possible that Dumbledore knows already about some set of Time-Turner use which is about to happen for (from his standpoint) completely separate legitimate reasons. Second, it is possible that there's no easy way to check if a Time Turner has been used other than to see if it can still be used (see the earlier instance where they checked if Harry's Turner had been used by having him deliver a specific message to the past), and given the precarious nature of the situation, Dumbledore doesn't want to waste any of Harry's Time-Turner hours if he can avoid it.

See in context