Snape might very well have known that the wand owed its allegiance to Harry and didn't even have Dumbledore to share it with. On the other hand he could have been under the same impression Voldemort was and believed that it belonged to him.
This nuance was lost on Lord Voldemort, who wrongly assumed Severus Snape held the Elder Wand because he was Dumbledore's killer, when in reality Draco had disarmed Dumbledore before Snape arrived on the scene, making Malfoy the wand's true new owner.
Why didn't Dumbledore tell Snape about the Elder Wand so Snape could break it before Voldemort found it? The answer is simple: It was far too risky for Severus Snape to be aware of both the Hallows and the Horcruxes.
Although Voldemort is currently using the wand, he notes that it doesn't behave as it should for him. By killing Snape, he hopes that it will change its allegiance to him. However, he doesn't want this to backfire (as we see it does when he tries to kill Harry, the Wand's true owner, with it).
Snape was never the Elder Wand's Master, so Voldemort killing Snape was pointless. Ownership of the wand then passed from Draco to Harry Potter, when Harry physically overpowered Draco and stole his wand from him, simultaneously claiming ownership of both Draco's own wand and the Elder Wand.
Quirrell didn't use the Killing Curse on Harry, because Voldemort said “use the boy” to get the Sorcerer's stone from the Mirror of Erised.
In order to conjure the avada kedavra curse, you have to want to kill your victim. We all know that Voldemort could easily kill a child without an ounce of remorse... but not Snape. Snape didn't want to kill Dumbledore, and this was why the spell was blue instead of the usual green.
Voldemort would dodge it. That's the simple answer. There's no way they could hit him with it. Harry did try to use the killing curse in movie 5 against Bellatrix who stated something to the effect he couldn't do it because he really had to mean it, implying it had to be in his soul to want to kill people.
Though Harry encountered many opportunities that deemed Avada Kedavra necessary, it remains as one of the Unforgivable Curses Harry Potter never cast. For one, he viewed the spell as an immoral practice commonly used by users of the Dark Arts.
He was on the point of collapse when it happened,” Rowling said. “Dumbledore didn't want to lose his wand at that point and Draco disarmed him. So that meant that the wand gave Draco its allegiance, even though Draco never knew it, even though Draco never touched it.
Similarly to Harry, Snape's patronus represents a person. In the memories he gives Harry before his death, Snape shows Dumbledore his patronus, using the form to prove his love of Lily Potter, Harry's mother.
However, Snape demanded of Dumbledore that his love for Lily (his reason for switching sides) be kept a secret, especially from Harry, because of the deep animosity he felt towards Harry's father and his mixed feelings towards Harry (who reminded him of both his love for Lily Potter and her death, and his animosity ...
Now, as firmly established, Snape was not the greatest fan of Harry, but that didn't mean that he ever stopped loving Lily. Dumbledore was surprised that Snape seemed to care for the boy. With a swish of his wand, Snape conjured up a Patronus – Lily's Patronus, a doe. 'Always,' he said.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
The most powerful wand in the entire Harry Potter universe is the Elder wand — one of the three Deathly Hallows. Made out of the tail hair of a Thestral, the wand can only be handled by the strongest of wizards. Made by Death itself, the wand can be used with the other Deathly Hallows to make one the master of Death.
He was under orders from Lord Voldemort to kill Dumbledore, and had made multiple attempts over the course of the year to do so, terrified for his family's safety. Draco had no idea that by disarming Dumbledore, he became the master of his wand — the Elder Wand, one of the Deathly Hallows.
The darkest of the Dark Arts, Harry Potter unforgivable curses are the Cruciatus Curse, the Imperius Curse, and the Killing Curse. Although the curses are highly illegal, Harry using Unforgivable Curses happened, but he uses them once he was thrust into the Second Wizarding War.
None of the good guys dare use the Killing Curse throughout the events of the movies and books, no matter how high the stakes and how difficult things are. 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.
He did not even wish he had chosen differently — he believed he had made the only reasonable choice. He felt what he said, regret. Because he had to kill his most useful servant. His other Death Eaters either fled or were imprisoned when Voldemort was 'half-dead'.
Description and effects: The Killing Curse is a lethal curse that causes instantaneous death upon impact. Compatibility with Bellatrix's death: Bellatrix's sudden death aligns with the effects of the Avada Kedavra curse.
It's a word that gained so much more clarity and tragedy after Harry Potter and the Deathly Hallows revealed that the nefarious Professor Severus Snape was actually serving a nobler cause: protecting Harry from Voldemort out of love for Snape's childhood friend Lily Evans.
in Hogwarts Legacy. It kills an enemy instantly; it cannot be blocked and will break any Shield Charm. This spell can be learned from Sebastian Sallow during the relationship quest In the Shadow of the Relic, but Sebastian's offer can be declined.