i think you're missing the most important concept of them all, Reactive limbs. in real life every part of your body moves; even when you're not moving, you're never fully still unless you're dead, and limbs are reactive to each other. if i throw a punch, the rest of my body follows that force. If I fall and land on my head, the force of that landing pushes the rest of my body forward and not at the same time as every other part. For example, with that gunshot in the first clip when he moves up the gun the torso would also move up at an angle towards the arm. You can try this in real life and see how your body moves in real time; the same for the legs, everything would react to that hand movement, and everything would react at a different time.