Corrected entry: When Harry is viewing Snape's memories in the pensive, there's a scene where Snape is talking to Dumbledore and Snape casts Lily's patronus. Dumbledore was already supposed to be dead during that scene, because the patronus went to Harry's aide at the frozen lake from Harry Potter and the Deathly Hallows part 1. Dumbledore had died in the previous movie before that.
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Correction: You are confusing two different events. This scene definitely took place before Dumbledore's death, but it is not the same time as when Snape sent the patronus to Harry. Snape is merely showing Dumbledore that his patronus' shape is still a doe, the same as Lily Potter's was. It is Snape's way of telling Dumbledore that he still deeply loves Lily, even many years after her death. When Snape sent the patronus to Harry, it is much later and after Dumbledore had died. There is a brief "flashback" scene inter-cut within this showing when Harry saw the doe patronus in the woods that led him to the Sword of Gryffindor. This was not Snape's memory, but it is Harry's, and it is meant to tie the two incidents together and reveal that it was Snape who had sent the patronus and the sword to Harry in part 1.
raywest ★