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William_Quixote comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapters 105-107 - Less Wrong Discussion
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Comments (353)
The Defense Professor sent Harry the forged message after 11:04pm, but early enough that Harry was able to arrive at 6:49 with 1 hour left on his time turner. The time-turner has been confiscated, but this is still a big security hole.
Example possibility: Harry and Quirrel arrive at the mirror, and time-turned Harry is already there with Dumbledore, Moody, Madam Bones and a dementor, which had not been detected by present Harry because patronus 2.0 is out and shielding everyone from it. Quirrel can't apparate away in Hogwarts, patronus 2.0 stops any AK, and Dumbledore & friends can hold Voldemort off long enough for the dementor to start sucking face with Voldemort, who is particularly vulnerable. Harry retrieves his time-turner and goes back an hour to message Dumbledore via patronus and set this ambush up. Asking Harry to state whether he has betrayed him is of limited use here, since the betrayal can happen in the future but impact the present.
Why has The Defense Professor deliberately preserved an hour on Harry's time-turner? It must be significant to his plan.
I noticed that as well. However, at Azkahban QQ reserved an extra use of the time turner for the end and it proved necessary. He may just think that as a best practice for plotting one should leave an extra use of time turners in as margin of safety.