Harry Potter And The Order Of The Phoenix - How Did You Know That?
During the scene in the Depeartment of Mysteries Luna uses the spell levicorpus, but that spell is not introduced until the 6th book, and there is no evidence of any of them having discovered or used the spell in 5, the spell also had the wrong affect, it should have hung the person up by the ankle,not blasted him backwards.
The Levicorpus spell had been widely used by Hogwarts students when James and Snape went there, and there's nothing to suggest it completely vanished from use; Luna could have easily learned it from an older wizard.
Firstly, harajuka is wrong; Impedimenta is a blocking spell, as its name suggests. Levicorpus (Latin for something like "lift the body") is the spell that suspends people by their ankles.
Secondly, although Levicorpus isn't mentioned by name until book 6, the Death Eaters use it in book 4 in the scene after the Quidditch World Cup Final.
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