The butt-shot!!!

I recently got Counter Strike: Condiotion Zero and while I was playing I realized that apart from the head shot that kills the other person immediately, one can also use the "Butt Shot". Just aim at the enemy's buttock while playing through a sniper rifle and shoot. The person dies immediately. I am also sure that, that person's health was full cause I was playing de_dust with me alone as terrorist and three others as counter terrorists. I had only seen two other bots whom I had killed in one shot(the headshot that time). I will try this more number of times and confirm!!