That would mean that they have to decouple the upper torso animation from the lower torso animation. Right now, all the animations are motion captured, so what they did is mo-cap a guy drawing a weapon and putting it away while standing still. They didn't mo-cap a guy doing it while running, so that's why it looks like what it looks like.

I'm not sure if making the running legs animation separate from the weapon drawing animation is gonna be that easy.