Harry Potter and the Killing Curse

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“Avada Kedavra” The Killing Curse was cast. Harry never expected this from Snape. He wanted to save DumbleDore. He suddenly remembers a line from the Half Blood Prince's book about defeating the Killing curse. It said "Calculate the power of the curse and use the exact same amount of the potion Elixir of Life to cure the affected". Next was the process of calculating the power of curse. The C

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