The man had already given up, all the bullets in his gun were worn out, and none of them hit Aatrox. In acceptance, he just knelt on the floor and bowed his head.
Aatrox might as well kill him, but if he did that, he would not complete his purpose of coming here today. First, if you want information, you need an informant. Second, if you want to send a message, you need a messenger. That man was the perfect person for it. But he needed to be quick, as the shooting noises may have alerted the other guards who were on patrol.