They got off the dragon and jumped into the lake. They talked and then Harry had a vision that Voldemort knew they were after the Horcruxes so he needs to make sure that the last Horcrux is safe. It was hidden in Hogwarts.

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My Chapter Summary On Harry Potter and the Deathly Hallows
Fanfictioncredits and honor to Author J.K. Rowling who will always be my inspiration in writing.