considering the size of the campus, normal noise levels, communication, etc.
um, gun fire (unless you are using a silencer and I haven’t heard the nut was) is very, VERY LOUD. It would easily rise above normal noise level. I realize kids are loud, but kids being kids is not the same sound as gunfire and screaming.
No, but it does prevent you from hearing reports over the walkie-talkie WHERE the echoing gunfire is actually coming from, how many shooters there are, etc.