Couldn't a dark wizard just use Avada Kedavra on Fluffy without knowing its secret sleeping stimulus?
Why was Fluffy a big deal to Dumbledore and Voldemort?
Couldn't a dark wizard just use Avada Kedavra on Fluffy without knowing its secret sleeping stimulus?
Why was Fluffy a big deal to Dumbledore and Voldemort?
Magical creatures are shown to be resistant to various spells, curses, magic in general. We have basically 2 options when it comes to Fluffy:
Fluffy is magically resistant to the killing curse
Quirrell/Voldemort did not want to let people know that they had retrieved the stone.
Once the traps were set we can assume that people did not regularly walk through all the traps to double check as that would involve all of the teachers who laid traps to redo the traps, that instead they would look in see Fluffy was there and walk back out, however if Fluffy where to be dead, that's an instant giveaway that someone has broken in.
I'm more partial to number 1 because I believe we can assume a lot of the larger creatures are resistant to the killing curse. For example Giants are a legitimate threat when combating wizards, however if you could simply kill them with Avada Kedavra, they are actually just giant muggles and in essence worthless. Dragons are another creature I think we can safely assume as being killing curse resistant. (maybe not their eyes however)
Examples of magical creatures being resistant:
While Hagrid was running from the death eaters in Half-blood Prince, we see him getting shot repeatedly by stunning spells and others and some bouncing off of him and others having no effect. They mention this being due to giant blood.
Sirius specifically states in hp4 that Dragons are magic resistant, except for the eyes, (then he is cut off) otherwise he says he would have suggested what Krum did and shoot a curse into the dragon's eye.
The blast ended skrewts, (I believe from book 4 as well) where shown to be HIGHLY magic resistant, (I believe the book mentions spells literally bouncing off) as the students had to use spells over and over again to subdue them when they were smaller to get them into cages. At the end of the book in the maze I believe (Harry?) encounters a fully grown skrewt and nothing he throws at it has any effect (essentially now completely magically immune).
People think that casting Avada Kedavra is the same as casting Wigardium Leviosa. It's not. You need power to cast the Killing Curse and intense concentration. It also kills instantly any mortal being or beast. No living thing has resistance against it, which is why Harry had become SO famous when he was a baby.
Quirrell was weakened by Voldemort (in fact the possession was slowly killing him) and I don't think he was that adept in casting that curse. Even if Quirrell was strong enough then, it's much harder to cast that curse while getting attacked by a gigantic three-headed dog, which wants to eat you, in a small corridor than casting it on a disarmed victim who begs for their life (remember it needs intense concentration).
Voldemort could cast several Killing Curses in a row, but he was one of the few who could. Even Bellatrix who was a master of the Dark Arts, preferred to use Stunners or Cruciatus Curses in duels (and used only a few Killing Curses when she had the chance).
Even if Quirrell somehow managed to kill Fluffy, he would be severely injured himself. It would be impossible for him to get past the Devil's Snare, he would get killed and Voldemort would have escaped. So he decided to find a more peaceful way to get past him.
It also kills instantly any mortal being or beast. No living thing has resistance against it ~> Wrong. Phoenix can survive a killing curse. Dragons are also seen resistant to Killing curse.
– user931
Jan 23 '21 at 21:39
I do not believe that any magical creatures are immune to the killing curse - just based on Barty Crouch Jnr.s claim (whilst impersonating Alastair Moody) that "there is no counter-curse, no blocking it." I think if Wizards noticed a magical creature was immune to the killing curse they would develop a way to harness that magical power, as they do with Dragon Hide gloves, for instance, and that Crouch would have mentioned it in the lesson at that point.
Presumably, if Fluffy were to die, he would die on top of the trap door, and block it quite effectively assuming that he/she is resistant to lesser magical spells, such as transfiguration or vanishing, even whilst dead.
of course avada kedavra could be used, but you just can't use an UNFORGIVABLE CURSE under the very nose of Albus Dumbledore unless you want to have a picnic with dementors for the rest of your life, unless, of course, you are He Who Must Not Be Named...that's why Fluffy did'nt have a problem from the killing curse