We know that Avada Kedavra is "unblockable"

Why doesn't everyone use Avada Kedavra then, Molly Weasley vs. Bellatrix for example?

Why didn't they both just cast Avada Kedavra to finish the duel instantly?

  • Why Death Eaters didn't use AK was already discussed here: Why don't Death Eaters always use Avada Kedavra?

    Also, while not mentioned in canon, another reason Bellatrix specifically didn't use it in a duel with Molly was underestimating the opponent. She was not exactly thinking rationally.

  • As far as why those opposing Death Eaters (let's notionally call them Good People) didn't use it:

    1. You need to be a strong magic user for AK to work. Fake-Moody explained that in GoF:

      "Avada Kedavra's a curse that needs a powerful bit of magic behind it — you could all get your wands out and point them at me and say the words, and I doubt I'd get so much as a nosebleed."

    2. Legal repercussions.

      Avada Kedavra is illegal. Aurors needed explicit authorization in the First Wizarding War to use the three Unforgivable Curses.

    3. They are "moral".

      They don't wish to kill.

    4. They obviously aren't trained in using it.

      Especially housewife Molly Weasley, since your question explicitly singled her out.

    5. Specific to Molly's duel - she wouldn't want to use Avada Kedavra since a miss would be risking to kill an innocent bystander, even if she knew how to cast Avada Kedavra.

  • Which spell did Molly then use? The green bolts ( movie ) she fired? Bellatrix did protecht herself from. – Roel Sep 3 '15 at 14:47
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    @Roel - Good question. One previously asked - as it happened, by me :))) – DVK-on-Ahch-To Sep 3 '15 at 14:48
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    I find it difficult to believe that Bellatrix isn't powerful enough to pull off an AK, she certainly wouldn't care about the legal ramifications and she was quite clearly trying to kill Mrs Weasley. – Valorum Sep 3 '15 at 14:49
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    @Richard Bellatrix is also quite sadistic remember. She may enjoy 'playing with her food', so to speak. – Dr R Dizzle Sep 3 '15 at 14:52
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    @DrRDizzle’s point is very salient: Bellatrix wouldn’t want to use Avada Kedavra except as a last resort, because that would deprive her of a chance to torture her opponents. She enjoys battling and inflicting pain far too much to want to go for a simple, pain-free ‘bang, you’re dead’ solution. Contrast this with Voldemort who didn’t care an iota about the lives of others, but who didn’t take any particular sadistic pleasure in inflicting pain in them either. Crucio was simply a tool for him, a means to an end. To Bellatrix, it was like royal entertainment. – Janus Bahs Jacquet Sep 3 '15 at 15:31

Because the use of the curse would get you a one way ticket to Azkaban as Mad Eye Moody so kindly put it

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    Isn't this already covered by DVK's extensive answer? – lfurini Dec 27 '15 at 21:45
  • yes it is alredy covered but i wanted to give a short clear cut answer to those who ddint feel like reading DVK's answer – Fingolfin Aug 1 '16 at 16:55

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