I don't like your theory. Why? Because blading off or shooting the old military way (sideways) to present a smaller target is likely to get you killed.
Hunters wait, wait, wait for that broadside target, the chance to drop both lungs and end the game then and there.
You can take a torso shot and even live without one lung. Plenty of people do. Your combat lifesavers have the equipment and training to manage one dropped lung. You can even survive a heart shot if your medic is close by and can treat tamponade. But a broadside shot to both lungs will drop you in your tracks just as surely as it drops a deer. It is a game-ender.