"If meeting Harry and Sirius showed nothing else, it is that the rules we understand, of any sort, don't apply about this ship," Lupin said. "Harry comes from a time after you did, Sirius and I before. How that happens doesn't make any sense, but it does mean that, if we win this battle and all is put back as we hope it will be, things will not necessarily proceed as they did. Cedric, I won't pretend it is possible that you will return and be killed, but it is not a guarantee."