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HungryHippo comments on Harry Potter and the Methods of Rationality discussion thread, part 25, chapter 96 - Less Wrong
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If the invisibility cloak is so good at shielding people from death AND the Potter/Peverell family is focused on defeating death, why didn't James put baby Harry and Lily under the cloak as soon as they knew Harry was a target?
Harry is going about his daily life under cloak w/ broomstick now; surely his parents--who spent more time with Mad Eye than Harry has--would appreciate the need for constant vigilance when Voldemort wants to kill your baby.
The Potters did not know that Voldemort was after their son specifically, only that they were in general danger from the Death Eaters by being opposed to them and also active members in the Order of the Phoenix. At this time, they were hidden by the fidelius charm, which is some pretty serious magics: "As long as the Secret Keeper refused to speak, You-Know-Who could search the village where Lily and James were staying for years and never find them, not even if he had his nose pressed against their sitting room window!"
Voldemort only went for their son after Snape told him of Trelawney's prophecy, which was immediately after it was spoken, making very little time for McGonagall to inform Dumbledore and for the OotP to react. (Even supposing they could decipher the prophecy instantly.)
Also, the note from Dumbledore specifically says that James left the cloak in Dumbledore's possession before he died. (Maybe to prevent it from getting into Voldemort's hands.) This explains why the cloak was not available when then Potters needed it the most.
Really late reply, but: the prophecy was made before Harry was born; Voldemort and Dumbledore found out about it at roughly the same time (almost immediately); and the attack came when Harry was fifteen months old. They knew about the prophecy while they were in hiding.
I'll be damned. Good correction!
Since Dumbledore was the strongest magician of them, giving the cloak to Dumbledore to fight more effectively might have been effective.
Of course, Dumbledore doesn't need a cloak to become invisible ... in the books, he requests it so he could study a real deathly hallow, possibly while squeeing.
This explanation assumes that:
1) The Potters didn't have the cloak on them because they trusted in the Fidelius Charm to keep them safe from Voldemort/Death Eaters.
2) The Potters didn't have the cloak on them because they did not trust in the Fidelius Charm to keep it safe from Voldemort/Death Eaters.
So yeah, I don't buy it.
I think you missed my point.
We know the Potters did not have their cloak because Dumbledore said so in his note to Harry.
To defend my parenthesis: earlier in the war, Voldemort taught Dumbledore that a human life is not of infinite worth. A corollary of this is that three humans lives may not be worth more than a deathly hallow. I.e. that the protection adequate for the safeguarding of three humans is not adequate for the protection of a deathly hallow (if the risk is that the deathly hallow falls into the hands of Voldemort).
In Escalation of Conflicts
In Multiple Hypothesis Testing
James must have known that it wouldn't be very long before Voldemort found Lily and Harry even with the Cloak, given Voldemort's legendary powers. Trying to hold him off despite this was still a better idea, as it would at least give Lily and Harry the chance to flee rather than hide.
Agreed, but wouldn't a true cloak of invisibility still be a good thing to have while fleeing? Hiding in a corner of your house would be stupid, since everybody knows that's where you live, but if the Death Eaters aren't quite sure what city you're in, it would be good to be able to walk into the supermarket without anybody recognizing you.
I don't understand, we're talking about the instant Voldemort breaks into their house, right?
On a related note: Why didn't the Death Eaters just blow up the Potter house? Sure, they wouldn't be able to find their actual bodies, but it seems like blowing up the most likely place your prey are hiding is a smart move.
Similarly, why did Voldemort go to Godric's Hollow all by himself? He KNEW the prophesy, so he should have been a bit cautious. Plus, considering the source of his info on the Potters, he should have been a little suspicious about walking into a trap. If he had gone with henchmen, the henchmen could have killed Harry/blown up the house after Voldemort disappeared, thus allowing the Death Eaters to cover up Voldemort's disappearance and at least try to figure things out for 5 minutes before surrendering completely.
Because they would just be setting themselves up for the No-one Could Possibly Have Survived That trope.
It may be that Voldemort didn't have the manpower to take out the Potters, the Death Eaters tied up elsewhere.
In Coordination Problems, Part 2
In order for fifty Death Eaters to wreak the havoc that magical Britain is recovering from, they would literally need to be working round-the-clock, the Dark Mark being an example of the extreme discipline and obedience needed to be one. Voldemort may have wanted the Potters taken out ASAP, but he'd already sent everyone out on assignments. Snape wasn't going to do it, and based on what we hear about the Potters, he and Bellatrix were probably the only Death Eaters capable of actually taking them out.
... can you do that if it's under a Fidelius?
Note that the Grimmauld Place mansion took up no space in the neighborhood outside when Harry went there. I'd also imagine (purely because Fidelius is supposed to be a slam-dunk in terms of defense/secrecy) that, for example, if you tossed a baseball from one house to the other "across" a Fidelius'd house, the baseball would not vanish at the boundary as it falls into the hidden lawn. So presumably there's a spatial effect going on that would exclude such things from working.
Something curious happened in canon, where the Death Eaters knew enough about #12Grimwald Place to set up a vigil around it, but they couldn't enter until one of the keepers actually showed them in, so Harry et al had to stand at the very edge of the wards and apparate everywhere. What's curious about this is that it means Snape told them enough (or maybe it was Creacher? Hm.) to narrow down its location, but not enough to get in, and this never set off "Snape is hiding something" alarms among the Death Eaters. Which tells me that the naive interpretation where the secret dies with the original keeper was the common interpretation, but the Order of the Phoenix knew that it was much less secure than that and everyone who knew the secret became co-keepers on the original's death. This also begs the question of what happens when all the keepers die (what happened with Godrick's Hollow? The magical Graffiti implies that the Fidelius was broken altogether, not just by Voldemort).
So, according to canon, it's still possible to lay siege to a place under the Fidelius, and the Death Eaters eventually broke in because Yacksly was grabbing Hermione when the trio made a return trip (How would that work with a small animagus, I wonder? Tracing wards probably wouldn't work--the trace on underaged magic apparently wasn't enough to get anyone in to any of the locations under Fidelius in Canon).
I think it was actually the constant use of the name Voldemort by Harry and Hermione, as they had not yet heard of the Taboo, that told the Death Eaters there was something worth investigating in the area.
Prediction: we shall see Fidelius Charm 2.0.
I was under the impression that it just appeared to take up no space. It was there, just your brain couldn't actually take notice of that. People do keep describing it in terms of it being impossible to locate, not that it spawned a pocket dimension or anything.
Using your example, the baseball wouldn't vanish at the boundary, you just wouldn't notice that it was passing a house, and couldn't be able to explain why you can't throw it as far in this spot.
The problem is, there's an easy way to break that. If you toss a ball so that it lands in the yard, it's in a place you can't access: from your point of view the ball has vanished. Then you can break the Fidelius for certain purposes by figuring out the general neighborhood and then tossing conjured balls everywhere, then picking up all the ones you can find (magically) and counting them. If you're missing a ball, it's because you can't find it, so there's a Fidelius or equivalent nearby. Repeat on smaller scales until you've narrowed it down to a particular house, then Fiendfyre.