There's a huge difference between firing back at an enemy that is attacking, and spraying radio signals all over the horizon even though nobody is attacking yet. The former won't tell them anything new, but the latter (which I'm talking about), is (was?) considered somewhat dangerous.

When I said "triggered" I meant you would enable it when under attack, at which point it doesn't matter if they know you're there anymore.

Are shotgun pellets supersonic?