I think the devs have probably played with the animation speeds alone. Think of it like fast forwarding a video, the quicker animations are unnatural when simply sped up, but if the animation sequence itself is altered to speed up the animation, you can create a quicker animation whilst still maintaining an accurate simulation of physics, hence natural movement. Maybe the devs are looking for the ideal animation speeds, before tweaking the animation in more detail in order to naturalize the motion.
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