gwern comments on Harry Potter and the Methods of Rationality discussion thread, part 10 - Less Wrong

11 Post author: Oscar_Cunningham 07 March 2012 04:46PM

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Comment author: gwern 17 March 2012 01:08:10AM 3 points [-]

Perhaps the twins were very careful with the Map, as would be appropriate for illicit tools of mischief, and never used it while they were in the same room as anyone else.

Well, yes, so imagine their shock when after the usual precautions they solemnly swear and see a third person listed in the room with them.

Comment author: loserthree 17 March 2012 01:59:12AM 0 points [-]

The Disillusionment Charm is commonly known, yes?

That wouldn't be mysterious, I don't think. It would be shocking and frightening and frankly it ought to have happened at some point and the twins ought to have lost their Map because of it.

Or maybe they take precautions that would protect them against all the hiding tricks they know about and, you're right, still encountered an extra name now and then. Still, I have a bit set that suggests the narrative would be more specific about that case, though I can't justify it.