"B-blood of the enemy ... forcibly taken ... you will ... resurrect your foe." - Wormtail
The Eight of Swords represents someone feeling restricted by circumstances. He is confused and powerless due to a lack of freedom and choice.
Bound head to toe on the Riddle gravestone, Harry is helpless to do anything but watch in dread as he is used as a tool to restore power back to Voldemort. Things have spiralled out of control so quickly since Harry had thought he would claim victory for Hogwarts by grabbing the Triwizard Cup.
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