I wouldn't have thought that would be an appropriate mechanism for the Killing Curse, myself, given that it is explicitly stated both that it's
unblockable (short of a sufficiently durable physical obstacle) and that before Harry's special circumstances, *no one* has ever survived it.
Unless you have some sufficiently impressive explanation for why no one in the entire history of the wizarding world who's ever been hit with that curse
has been able to make their saving throw, this strikes me as something which would strain plausibility - and my suspension of disbelief - quite a bit.
unblockable (short of a sufficiently durable physical obstacle) and that before Harry's special circumstances, *no one* has ever survived it.
Unless you have some sufficiently impressive explanation for why no one in the entire history of the wizarding world who's ever been hit with that curse
has been able to make their saving throw, this strikes me as something which would strain plausibility - and my suspension of disbelief - quite a bit.