After dragging [Fred]'s body to safety, [Harry], [Ron], and [Hermione] somehow force themselves - and each other - to continue going after [Nagini].
[Harry] dives inside [Voldemort]'s mind, trying to discern his location - and discovers him to be in the [Shrieking Shack], sending [Lucius Malfoy] to find [Snape].
Trying to decide how best to go after [Nagini], the trio is ambushed by [Death Eaters] and spared by some quick spellwork from [Hermione]. They then throw on the [Invisibility Cloak] and run through the battle, watching small victories for both sides, including [Hagrid] as he is carried off by [acromantulas]. They are saved from [dementors] by [Luna], [Ernie], and [Seamus], and finally make it to the [Whomping Willow] and inside.
[Harry] leads [Ron] and [Hermione] down the tunnel to the [Shrieking Shack] where, hidden under the [Invisibility Cloak], they watch [Voldemort] kill [Severus Snape] in order to gain mastery of the [Elder Wand]. He departs with [Nagini] and Harry rushes to Snape, who urges Harry to take the memories gushing from his mouth, ears, and eyes, and then dies.
Still sitting in the [Shrieking Shack], [Harry] hears [Voldemort]'s voice commanding his army to pull away, and demanding that [Harry] meet him in the [Forbidden Forest] within the hour.
[Harry], [Ron], and [Hermione] make their way back to the castle, with scenes of destruction meeting their eyes: the [Weasley] family mourning [Fred]; [Lupin] and [Tonks] lying together, dead; and a castle ripped to shreds.
Reeling from the [Great Hall], [Harry] runs to [Dumbledore]'s office, pours [Snape]'s memories into the [Pensieve], and dives in.
[Snape]'s first memory: Snape watches as [Lily] and [Petunia Evans] play on the playground, Lily jumping far higher off the swing than any Muggle could. When Snape jumps out to tell Lily she's a witch, though, the girls laugh and run off.
[Snape]'s second memory: Snape and [Lily] sit, talking about [Hogwarts], and Snape tells her about the school and about [dementors]. When Snape catches [Petunia] spying, though, he drops a branch on her head and she and Lily run off again, irate.
[Snape]'s third memory: On [Platform 9 3/4], [Lily] prepares to leave for school with an angry and jealous [Petunia] saying goodbye. Lily lets slip that she and Snape found the letter [Dumbledore] wrote back to Petunia, though, leaving her angry again as she runs away from her sister.