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My understanding is that a portkey is usually only one way (uni-directional) so as the title says, why make the Triwizard Cup portkey able to return back to Hogwarts (bi-directional)?

Why bother to make it go back to Hogwarts, allowing Harry to use it to go back?

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  • An excellent first question. I've taken the liberty of tightening up the language used.
    – Valorum
    Apr 20, 2015 at 7:31
  • Excellent first question indeed, but unfortunately a duplicate :(
    – Kalissar
    Apr 20, 2015 at 8:28

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