At the end of the fifth book of Harry Potter, "The Order of Phoenix", there is a prophecy concerning Harry Potter and Lord Voldemort:
The one with the power to vanquish the Dark Lord ( Lord Voldemort) approaches ... born to those who have thrice defied him ( that's Harry Potter), born as the seventh month dies ... and the Dark Lord will mark him as his equal, but he will have power the Dark Lord knows not ... and either must die at the hand of the other for neither can live while the other survives ... the one with the power to vanquish the Dark Lord will be born as the seventh month dies ...
I am confused over the phrase
neither can live while the other survives
What does it mean? Does it mean anything? On the surface it seems it does. But upon further thinking this phrase is self-contradictory. If neither Potter nor Voldemort lives, then by logical deduction, the second phrase "while the other survives" is certainly false. Similarly, if either Harry Potter or Lord Voldemort survives, than it follows that the first phrase "neither can live" is logically false.
Juxtaposing two contradictory statements together in a single phrase makes the phrase completely meaningless. It's like saying "I am A, but I am not A"-- is this phrase true or false, or neither true nor false? Similarly, "neither can live while the other survives" can this phrase be true, or false, or can neither be true nor false?
Do I miss anything? Harry Potter's author JK Rowling's English is subtle indeed!