(a satire of human ignorance)
Snipers are trained to shoot specific ways in certain tactical situations. It is called a headshot, and current training talks about the T area of the face with the eyes being the crossbar and the nose the down stroke. With the right caliber, this will just knock a human down, so they cease to function.
It is still best to gain all the information you can before walking into those tactical situations. Intelligence gathering is very important. You need to know your target. Some humans do not use their brain. They use their gut. It is best to use a gut shot on these people. It will knock them down, and they will cease to function.