Corrected entry: In the chapter titled Hermione's Secret, Dumbledore says, "Miss Granger, you know the law you know what is at stake. ... You must not be seen." when instructing Harry and Hermione to use the time turner to go back and save Sirius. Throughout the chapter, Hermione tells Harry that they must not be seen and that he can't interfere for it is against wizarding law. However, during the entire school year Hermione has been using the same time-turner and has been going back in time to complete classes so every time she uses it she obviously has been seen by everyone in her class (as pointed out by Ron. He brings up Hermione's mysterious ability to attend two classes at once, saying "And Ernie McMillan told me she's never missed a Muggle Studies class, but half of them are at the same time as Divination, and she's never missed one of them either!"). Since she is allowing herself to be seen in those cases, why can they not allow themselves to be seen to change the p.
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Correction: Nobody (except for some of the teachers) knows that Hermione is using a Time-Turner, but that's beside the point. She wasn't doing anything differently when using it for her extra classes. An example of that would be if she used the Time-Turner to go back to a class that she already did to try to improve on an assignment. If she did that, then there would be two Hermiones in that classroom at the same time, wherein lies the reason that she needs to be careful when using it.
Knever