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As Voldemort Disapparates, they came out of the woodwork and Harry and Snape exchange an understanding look, Harry gathering Snape's memories that poured from him as he died there from Nagini's poison. Snape was bitten in the neck, not snake food or Snape wouldn't have lasted long enough to give Harry his memories. Nagini did not come out of her floating magic ball. The ball rolled onto Snape as the upper half of his body was contained in it. I don't think Harry and Snape exchanged understanding looks. Harry was shocked and Snape was bleeding to death.
Snape was also involved in James's death: Snape was the Death Eater who relayed the Prophecy that foretold the birth of the one who would defeat Snape's then-master Lord Voldemort. When Voldemort was informed of this, he chose to get rid of James, his wife, and their son.