[Army Air Corps]

Even with a suppressor, people would notice concert attendees dropping to the floor and the blood spatter. I think that folks would notice that something horrible was happening.

[Red Badger]

Heads and torsos exploding from high velocity rounds would tend to get peoples attention.....................

[DCBryan1]

Even with a suppressor, people would notice concert attendees dropping to the floor and the blood spatter. I think that folks would notice that something horrible was happening.

and if the shooter used a rifle, it STILL would not slow down the bullet enough to stop the supersonic "crack" and the high angle impact bullet noises.