Вот почему вы мазали, когда злобно жали на курок с закрытым ртом при сжатых челюстях

Чтобы киллеры не поняли секрет  знатока искусственного интеллекта, я умышленно не перевёл его на русский.

Why do snipers open their mouth when about to shoot?

This answer is kinda gonna make you sad.

The shooters mouth is open because they are slack jawed. Literally.

A school of thought states that you should be in a position of almost going to sleep before you break a shot.

Relaxing your body is the key element here. Mouth closed or open, all elements must remain the same EVERY TIME.

So if a mouth or jaw is closed or clenched, that translates to sympathetic movement, minuscule mind you. But still there; at the the muzzle. This translates to feet and complete “misses” when you stretch that out to 800yds + (the normal effective range of a standard DM or “sniper”)