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Neville Longbottom beheaded Nagini
Nagini only killed Severus because Voldemort told the snake to "kill", so Nagini attacked him.
The Nagini battle lasts for about two or three minuets.
The cast of Nagini - 1991 includes: Shankar Nag
It's Nagini, not Nagani, and Nagini ate the Muggle Studdies Teacher in the Deathly Hallows.