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The double images are more pronounced at the top of the image than at the bottom, so I think instead of a bump, it was a pivot/tilt. The lower half of the image stayed in the same area of the frame and remained sharp, but as the camera tilted upward, the upper part of the image got that double image motion blur.
Easier for me to visualize than explain, but basically the pivot point was the lower half of the image, so it stayed sharper there.
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