I haven't read OotP in a while, but I watched the movie a few days ago. I was struck by how magically competent Umbridge was. The primary examples of her skill with offensive magic being how she is able to quite easily hit Parvarti's origami swan with what I believe is incendio (so, sniping a small, moving target.), her bombarda maximum demolishing the RoR's walls, (which is either quite an advanced display of power, or unremarkable, depending on what protective enchantments the room was...
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