automatically brought out of stealth, because, you know, they made a visible/audible attack which revealed their presence.
"...which revealed their presence," doesn't follow. It may or may not reveal their presence.
"Where did that shot come from?" is a valid question. Someone may notice that the shot came from over there. And the more shots from over there the more obvious it becomes. But it's reasonable that someone may be disoriented and not see the person attacking. Or just fail to perceive because of camouflage or any reason.
