Video camera is arched which makes the shooter look shorter than he actually is. Basically it distorts a true body frame and his running gait.
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I have 8 year old id. twin grand daughters, I have photos of them (not close ups) where one appears to be considerably taller than the other (4”-6”) in reality, they are both the same height. I also have a video of them running, they look the same in the video running and they don’t run the way that killer did.
I have also seen a real life midget running, he ran exactly like the killer did.
Not a dwarf.