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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 loved Lily. This caused his Patronus to take the form of hers.Lily's Patronus was a doe, and Snape knew this. Snape was in love with Lily and always has been and so adopted the doe patronus. Similar to how Harry's is a stag because of his father. It also probably has something to do with the memory Snape uses to cast the Patronus.