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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.
Yes, George Weasley lost an ear. His ear was cursed off by Severus Snape en route from the Dursley's, to the Burrow in Harry Potter and the Deathly Hallows. Snape used Sectumsempra! - a slashing curse (which he invented) in what is known as The Battle of the Seven Potters. His intended target was a Death Eater's arm.