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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.
A doe, same as Lily Evans because he loved her so much. According to the character Remus Lupin, a witch or wizard's Patronus can change from a great shock or emotional upheaval (Harry Potter and the Half-Blood Prince, USA Scholastic hardcover edition, p340). Snape's Patronus may have changed because he was tormented by her death or it may always have been a Doe as he always loved her. In the chapter The Prince's Tale, in Harry Potter and the Deathly Hallows, Snape casts his doe Patronus in front of Dumbledore, 16 years after Lily's death.