Let me explain:
Hitbox multipliers in Crysis 2 are different than in other FPS:

Basically it means if you shoot somebody with a Scar in his foot, you give him 10 shots, until he dies. If you shoot him in the head you need 2. A lot of people aren't understanding this, and call it lag. And yes, I know lag is existing, but you make it look even worse, without the knowledge that you NEED 10 shots to kill somebody if you shoot in his foot.
Aiming for the head = Profit