You have to remember Judgement is like half again the size of your character, and he's attempting to catch her trying to charge low under his strike by giving it a downward striking pattern at the last moment. The arm movement he's carrying out is somewhat akin to turning the wheel of a ship or something, but flat at the start.

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It has the effect of drawing the blade at first in line with her upper torso, but then the point will drop down and the middle of the blade will almost be slashing down vertically.