Why did Voldemort still trust Snape?
I recently watched the first Harry Potter movie and noticed a pretty big plot hole.
As we know, Snape turns over once Lily Potter dies and runs to Dumbledore for help and becomes a spy ultimately. Yet through the remainder of Voldemort's life, he believes that Snape is on his side yet he should have found out in the first movie.
As we know, Quirrell for the entirety of the first had Voldermort on the back of his head, living and breathing off him which means, shouldn't he also hear everything too?
When Harry and Quirrell are with the Mirror of Erised, he tells Harry that Snape was trying to counter curse his broom during his Quidditch match. Quirrell also gets confronted by Snape in the hallway (when Harry was snooping in the restricted section) telling him, he needs to figure out where his loyalties lie.
My question is, why didn't Voldermort hear Snape talking to Quirrell, figure out he was on Dumbledore's side and kill him once he rose?
Best Answer
Snape is a master Occlumens — that means he can shield his thoughts from those with skill in Legilimency, which is basically mind reading. Both Dumbledore and Voldemort are experts in this particular skill.
When Voldemort does rise again, Dumbledore asks Snape to resume his spying role with the Death Eaters. Snape is able to do this because of his ability to hide his thoughts, and can explain away his actions as trying to stay on Dumbledore's good side while he waited for his master to return.
I can't remember if it was mentioned in any of the films, but there is a part in one of the books where Bellatrix Lestrange questions Snape's loyalty, and he replies that if only the Dark Lord had trusted him rather than just possessing Quirrell, he would have been reborn years earlier.
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Did Voldemort trust Snape the most?
Snape seems to enjoy Voldemort's confidence as well. The reason, again, lies in Voldemort's arrogant confidence in his abilities as a Legilimens. He doesn't trust Snape as Dumbledore does, but he believes that he can detect any disloyalty.Does Voldemort know Snape is half-blood?
Pretty sure Voldemort would have known all the names of the pure blood families and the name "Snape" isn't among them, 'cause Snape got it from his muggle father.. Even if he did, I think that Voldemort turned a blind eye to half-blood Death Eaters, considering that he was a half-blood himself.Did Voldemort know Snape tried to stop Quirrel?
He only knew Quirrel was trying to steal the stone. Snape explained to Bellatrix that had he known it was Voldemort trying to steal the stone he would have assisted but since he didn't know he had to stop Quirrel or else Dumbledore would get suspicious.Did Voldemort care about Snape?
Voldemort wasn't even angry or upset over Snape's death. He chalked it up to being a calculated loss, killed him and went about his business, because Voldemort was incapable of feeling regret. He could mimic the emotion, but he never actually felt it. Voldemort never cared about anyone but himself.Why Voldemort Never Discovered Snape's True Loyalty
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Answer 2
This is relevant: Why didn't Voldemort suspect Snape as a double agent during Philosopher's Stone?
Basically, Snape would have had no way of knowing that Voldemort was under the turban. He also didn't know that Quirrell was attempting to assist Voldemort, and directly tells Voldemort in book 6 that he was trying to stop Quirrell to maintain Dumbledore's trust. This would have given him an excellent position inside Hogwarts when Voldemort returned.
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