Now that Snape has Harry and Draco practice Expelliarmus against each other -- the people that they hate the most -- those boys are going to eventually go on to use this spell to bring down, each of them, one of the most powerful wizards of the century. In both cases, it's going to be Draco's wand against the Elder Wand. Both Harry and Draco have been taught by the same person, and the wands consider their magic to be interchangeable.

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