Despite the security measures placed on the contents of the vault, the trio obtained Helga Hufflepuff's Cup and escaped on the back of the dragon that had been guarding the vault door.
Escape. The dragon which protects the vault. Harry, Ron and Hermione all hurled Stunning Spells and curses at the oncoming goblins throng to hold them off. Harry then used a Revulsion Jinx to release the half-blind dragon from its chains and the trio jump onto its back.
Not long afterwards, Hermione used some of Bellatrix's hair, which had fallen onto her clothes while Bellatrix held her hostage, to create Polyjuice Potion to impersonate Bellatrix. This made it possible for her, Harry and Ron to steal the Horcrux from the Lestranges' vault.
How did Harry know the cup was in Bellatrix's vault?
The clue he received in the film was from Bellatrix, who was in a frantic frenzy when she thought her vault was broken into. He is ultimately able to identify the cup as a Horcrux because of his ability to hear the piece of Voldemort's soul contained within them, an ability which is not present in the books.
Harry breaks its chains, and with assisting spells from Hermione, the dragon escapes Gringotts with the Trio riding on its back. Many miles from London, the Trio jump off the dragon into a lake and swim ashore.
Harry Potter and the Deahtly Hallows part 2 - inside Belatrix's vault (HD)
Why didn't Hermione use Bellatrix's wand in Gringotts?
Hermione and Bellatrix Lestrange's wand
Hermione, who used the wand to impersonate Bellatrix when they broke into Gringotts Bank, hated it. Because she hadn't won it, it didn't work properly for her, but it was more than that: Bellatrix's wand represented death, destruction and very Dark Magic.
Bellatrix Lestrange brutally tortured Hermione Granger with the Cruciatus Curse at Malfoy Manor and Harry used the Imperius Curse numerous times during the Trio's 1998 Gringotts break-in.
When Ginny Weasley, Neville Longbottom, and Luna Lovegood tried to steal the sword from the Headmaster's office, Snape gave the Sword of Gryffindor to Bellatrix Lestrange for safe keeping.
Why didn't they just show the goblin Bellatrix's wand?
They were asking because if she had Bellatrix's wand (which was stolen by Harry Potter) then she would be an accomplice of Harry. In the book, she gives them the wand and it alerts them that she is an imposter since the wand was known to be stolen. Harry then uses an imperius curse on the goblin in order to get in.
The group was caught and punished as a result. Following that incident, Severus Snape passed the counterfeit sword to Bellatrix Lestrange. Bellatrix then stored it in her Gringotts vault alongside Helga Hufflepuff's cup, one of Voldemort's Horcruxes.
Did Bellatrix know she had a Horcrux in her vault?
At some point in time, Lord Voldemort gave Bellatrix Lestrange Hufflepuff's Cup, one of his Horcruxes, to keep safe in her vault, though he didn't tell her its true nature.
However, despite being rescued by them, Griphook's general mistrust of wizardkind resulted in him betraying Harry Potter, Ron Weasley, and Hermione Granger. He betrayed them because he believed they would not hand him the Sword of Gryffindor, after destroying the Cup and other Horcruxes.
How did Bellatrix get her wand back after escaping Azkaban?
It is possible that their wands are kept somewhere in Azkaban for safekeeping. When she and her fellow Death Eaters escape, they manage to take their wands back. Furthermore, Garrick Ollivander himself confirms Bellatrix's ownership of the wand.
Harry survived Avada Kedavra multiple times due to the protection of Lily's sacrifice and the love-based magic that surrounded him. The Elder Wand, which Harry mastered, protected him during the Battle of Hogwarts and prevented Avada Kedavra from killing him.
At the beginning of the first book, Gringotts Vault 713, a higher-security vault, held a small grubby bag, which we later learn contains the Philosopher's Stone. Albus Dumbledore sends Hagrid to retrieve it while he escorts Harry to Diagon Alley.
How did the Goblins know Hermione was an imposter?
They know she's an impostor. They've been warned", so obviously the request for the wand was unexpected even to him. It's thus pretty safe to conclude that the real Bellatrix had reported her wand stolen and alerted Gringotts prior to the trio's attempted break in.
Why didn't Lucius Malfoy want to give Voldemort his wand?
After no volunteers presented themselves, Voldemort selected Lucius as an unwilling donor. Lucius reluctantly surrendered his wand after some prompting from his wife, identifying its wand wood and core for Voldemort's benefit.
Because Bellatrix and the Malfoys needed to be 100% certain it was him. Even though Ron and Hermione are often seen together with Harry, the disfiguration is sufficient, initially, to instigate the caution they show in the identification.
Honestly, Hermione knew Dobby was a lost case... nothing could have revived Dobby after the attack or she would have definitely helped Harry with Dobby considering she was the girl who started S.P.E.W(Society for the Elfish welfare) and fought for elf rights. There was nothing to be done at that point.
Why didn't Dumbledore tell Harry how to destroy Horcruxes?
Dumbledore Never Really Had Time To Explain How To Destroy The Horcruxes. As much as Harry would have benefited from Dumbledore's knowledge of how to destroy the remaining five horcruxes, there was simply not enough time before his death to do so.
Why didn't Dumbledore give Harry the sword before he died?
Question number one: Why didn't Dumbledore just give the sword of Gryffindor to Harry instead of leaving it to him in his will? He knew even before his death that Harry would need the sword to destroy Horcruxes, and he must have known that the Ministry would not let Harry get the sword.
After the Wizards' Council was reformed into the Ministry of Magic, tighter restrictions were placed on the use of certain kinds of magic. The Imperius Curse was deemed by the Ministry to be Dark magic, and, along with the Cruciatus and Killing Curses, were declared "unforgivable" in 1717.
But Ron Weasley is the exception, giving it a go in the Deathly Hallows: Part 2 movie when himself and Hermione look destined to die via Nagini. The curse just seems to go through Nagini like it's nothing whatsoever.
Not long after, Harry Potter found himself attempting the Cruciatus Curse on his own enemies — twice (though he failed during the attempts). The first time Harry cast Cruciatus was in Harry Potter and the Order of the Phoenix on Bellatrix Lestrange after she killed Sirius Black in the Department of Mysteries.
