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Anon finds a plot hole
(sh.itjust.works)
This is a place to share greentexts and witness the confounding life of Anon. If you're new to the Greentext community, think of it as a sort of zoo with Anon as the main attraction.
Be warned:
If you find yourself getting angry (or god forbid, agreeing) with something Anon has said, you might be doing it wrong.
This simplest explanation is that JKR isn't a very good writer. She came up with an idea "I'll give hard working and ambitious Hermione a time travel device so that she can take more classes in the same amount of time" without thinking deeply about the implications of allowing time travel to exist in the universe of Harry Potter.