It occurred to me just now, reading A Place to Call Home, that the HP prophecy would make a lot more sense if Sibyl's nature as a drama queen and Dumbledore's desperate hope for some clue to a victory made him misinterpret the actual words spoken - "Neither can leave while the other survives." Harry can't just pack up and leave for greener pastures, because Voldie can't stand to allow someone to have defeated him even temporarily to pass, and Harry would be compelled to chase after Voldishorts if he left Britain alone to build his power base elsewhere.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows