Then... there is the "Twitch Factor." Think about how you move. You blink... you turn your chin... you tilt your head. These are micro-movements. Fast. Unpredictable. And constant. The head is the most mobile part of the human body. The torso... however... is your anchor. It moves slowly. For a sniper... shooting at a head is like trying to hit a dragonfly. Shooting at a chest... is like hitting a barn door.