Evanora was defeated too easily
The fight with Glinda should have been longer and more full of struggle. As it is Evanora barely puts up a fight before she is beaten.
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The final fight seemed long enough, but Evanora did put up a good fight - she was winning until Glinda grabbed the necklace from Evanora which to Glinda's and Evanora's surprise, sapped Evanora's power and defeated her.