I don’t think Harry really could preserve the Death Eaters’ heads. Remember, he was out of magic, totally drained after the “Obliviate”. And he had to take of Voldemort first, to not take any chance of letting him escape. So even while Harry is good at “doing the impossible”, there is a limit to how much “impossible” he can do a limited time.
He might have a portable refrigerator set to 4 degrees C in that bag of tricks of his, but that’s a little much forward planning even for him. And that still leaves the problem of safely cooling ten times thirty-six pounds of meat down to that temperature without damage.
I don’t think Harry really could preserve the Death Eaters’ heads. Remember, he was out of magic, totally drained after the “Obliviate”. And he had to take of Voldemort first, to not take any chance of letting him escape. So even while Harry is good at “doing the impossible”, there is a limit to how much “impossible” he can do a limited time.
He might have a portable refrigerator set to 4 degrees C in that bag of tricks of his, but that’s a little much forward planning even for him. And that still leaves the problem of safely cooling ten times thirty-six pounds of meat down to that temperature without damage.