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In Philosopher's Stone Quirrell goes down the trapdoor, gets through all the defences, and comes to the mirror.

I've said on answers before that I reckon the defences weren't meant to stop anyone at all, merely slow them down so Dumbledore could go take a look. Nonetheless, to get to the Stone you have to pass a giant three-headed dog, and a troll.

Quirrell took the time to figure out how to get past Fluffy, and he 'had a way with trolls': he put Fluffy asleep and knocked out the troll (with his own club, I believe the implication was) (not sure how much of a 'way' Quirrell has with trolls in this case: you hardly need to be diplomatic to knock someone unconscious).

But why? Why put Fluffy asleep? Why knock out the troll? Why not just kill them both and stroll through?

I don't think it's because the creatures cannot be killed by magical means. There are a ton of spells that can kill, and many use 'natural' power (incendio causes fire, as opposed to avada kedavra, I mean).

What were Quirrell and Voldemort's motives for not killing Fluffy and the troll?

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Not necessarly. Let's say students in daytime pass nearby the door. They hear fluffy, and dare not enter. Some even try to enter and run (as it happened before Harry went to Hagrid). Likewise, it wouldn't be hard for Dumbledore to open the door and notice that Fluffy is healthy vs being dead. If he's dead, it means someone made an attempt at the stone, and he begins chasing immediatly. If Fluffy is alive, Dumbledore won't be in a rush to check on the other traps, and he might, potentially only check on them later. It's like robbing a bank. If you can do it quietly, you do it. – Oak Jan 4 at 11:40
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Actually, bonked troll by its own club might not trigger anything, either, because it might be considered self-damage versus an attack. – Aith Jan 4 at 11:44
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@Aith, haha, what a great defence! "Professor, I have this troll to guard the room. now, it may occasionally knock itself out, but we should be good!" I've just realised that sleeping fluffy would prob be fine cus they have to feed the troll so have to get past him. the troll was quirrell's so he would be in charge of feeding, since he has a way with them, and would then know fluffy can be slept safely. I may have just figured my own question... I'll leave it a bit and see if anyone can satisfy me more with less speculation – Mac Cooper Jan 4 at 11:46
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@MacCooper OMG this wasn't supposed to be so funny, but I'm having a laugh here. Okay, now I've got to grab my book just to see if I can satisfy this curiosity. I think you might be right; if nothing else, it would make sense! – Aith Jan 4 at 11:50
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up vote 44 down vote accepted

A potential answer can be found on page 289 in the hardback book when Quirrell explains to Harry that

"Certainly, I have a special gift with trolls - you must have seen what I did to the one in the chamber back there? Unfortunately, while everyone else was running around looking for it, Snape, who had already suspected me, went straight to the third floor to head me off - and not only did my troll fail to beat you to death, that three-headed dog didn't even manage to bite Snape's leg off properly."

Quirrell's statements about Fluffy not biting Snape properly and his troll not beating Harry et al to death suggests that Quirrell deliberately thought to use Fluffy and the troll against Snape and Harry should they try and foil his plan.

He considers his handling of trolls as a 'special gift' and he had to ply Hagrid for very specific information on Fluffy. Combined with the above suggestion - re: using challenges on those who would pursue him, Quirrell was confident that only he and Voldemort would be able to get past the challenges.

If he/they can get past but still allow for these challenges to pose a potentially lethal challenge for those in pursuit like Snape or Harry and company, then why not?

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All answers are good (and personally I believe perhaps correct -- one can have multiple factors affect a decision) but I'm gonna accept this one cus the quote and also cus as @DVK pointed out rationality doesn't seem to be Voldy's style. – Mac Cooper Jan 7 at 9:05

This isn't a canon based answer, but I would assume it was in order to keep his cover.

Quirrell had remained at Hogwarts all year, and still his secret hadn't been discovered. Snape suspected, but if he had been able to prove what Quirrell was up to then there would be no way he'd have remained at the school to teach DADA. Clearly Quirrell was planning on keeping his true intentions a secret for as long as was required.

His first attempt (as far as we know) to get to the Philosopher's Stone was Halloween, and Harry & co. catch him trying to get it close to the end of the year. That is a long time to go without even attempting to get the stone. Considering that he got the information on how to tame Fluffy months before when he gave Hagrid the dragon egg, he had the knowledge of getting past at least the first defense of the stone.

I don't think that Quirrell would have waited that long for a second attempt. There would likely have been other times that Dumbledore was called away on urgent business etc. that would have allowed him to sneak past Fluffy and attempt a couple of the trials. He had no way of knowing how many there were, or how long they would take him, so could not go in all guns blazing. If he had been discovered he would lose the chance to get at the stone for good.

Therefore in order to be able to go down the trapdoor numerous times, he needed to leave as little trace of his presence as possible. He likely cleaned up after himself whenever he entered and left. The only reason the troll was unconscious at the time Harry went down would have been because Quirrell was already there.

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This doesn't answer the question, though: You've given more of a synopsis of the story. The question is Why didn't Quirell kill his way to the stone? – Slytherincess Jan 4 at 12:21
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@Slytherincess If he kills Fluffy and/or the troll, it’s a pretty strong sign that somebody has made an attempt on the Stone. If they’re just put to sleep or knocked out, when they wake up nobody would know the difference. – alexwlchan Jan 4 at 12:27
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"If he had been discovered he would lose the chance to get at the stone for good." Killing his way to the stone is a sure-fire way to be discovered. – Snowman Jan 4 at 18:31
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@Slytherincess this wasn't his first attempt at the stone, he couldn't be certain it would be his last attempt at the stone, so he couldn't do any irreparable damage to any of the traps in order to maintain his stealth. This is fully explained in the answer. – Jason Jan 4 at 22:16

A few reasons spring to mind:

  1. He doesn’t want to attract unwanted attention.

    Killing a troll or three-headed dog is possible, but it probably isn’t easy. Such a creature is liable to make a lot of noise if, for example, you try to burn it alive.

    The third-floor corridor isn’t so far from parts of the castle frequented by students, and we know that teachers and prefects patrol the corridors at night. There’s a high risk of somebody hearing him trying to subdue the creature, and being caught in the attempt.

    It’s also possible that Dumbledore can detect unusually dark magic inside the school (such as Avada Kedavra). Those are not spells usually cast inside a school; they’d be bound to attract attention if noticed.

  2. He doesn’t want to leave a trace of failed attempts.

    If Quirrell finds an unexpected defence – for example, a magical mirror hiding the stone – he wants to be able to leave without anybody realising he was there. If Dumbledore realises that somebody was there, he’s bound to increase the defences around the stone, which makes Quirrell’s job harder. The stone might even be moved to an entirely different location.

    He leaves the harp in Fluffy’s chamber – he can pick it up on the way out – and I’m sure the troll won’t have any lasting damage from being knocked out. Neither are going to tell Dumbledore about Quirrell; they lack the intelligence and language skills to do so.

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Yeah I'm sensing a pattern -- I didn't think about repeated attempts. In my mind he just rushes in and rushes out. – Mac Cooper Jan 4 at 12:39
    
yeah this i think is it, in case he could not figure out all of the traps, by keeping everything intact, specifically fluffy alive, no one would know he had attempted. – Himarm Jan 4 at 15:13
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@MacCooper - unfortunately, we are dealing with JKR's Voldemort, not MOR's Voldemort. Therefore, #2 is unlikely because JKR's version of Voldemort is a certified doofus with no planning or rational thought, which #2 would require. IOW, Alex can think this up, but I doubt Voldemort would. – DVK-in-exile Jan 4 at 17:48
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@DVK Who is "MOR"? Edit: ah, of course, Methods Of Rationality. I should read it some day. – Oriol Jan 4 at 23:42

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