Question: A few questions about Snape's death: How did Voldemort slice Snape's throat with his wand without saying anything? Where exactly did Nagini bite Snape? Did he die from wounds or from venom?
MikeH
7th Aug 2016
Harry Potter and the Deathly Hallows: Part 2 (2011)
Chosen answer: More magically advanced wizards do not need to speak the name of the spell to cast it. In the books, Harry and other students spend time learning how to cast spells silently. It is not specifically explained how Nagini kills Snape, but most likely it is a combination of various bites over his body and the venom.
16th Mar 2015
Harry Potter and the Deathly Hallows: Part 2 (2011)
Question: Why did McGonagall send all the Slytherins to the dungeon? It was only one Slytherin who wanted them to turn in Harry, and many times in the series people say not all Slytherins are bad.
Chosen answer: Not all Slytherins were bad, but many were and they would fight against Harry. McGonagall did not have time to pick out which ones were allies or enemies. It was simply more efficient to lock them all up at once. Also, even though there were good Slytherins, they would know that taking sides against Voldemort and failing to fully support him could result in later retaliation against them or their families.
Answer: Nagini kills Snape by biting him in the neck, it was in the movie.