I was in an interior room when a 9mm handgun was fired. It was awful.
Remember that when you see a tv show or movie and there are 2,3, or more
people shooting pistols and RIFLES (AKs AR, etc) inside a building.
And especially remember what it was like when you see and hear the actors speaking in normal tones of voice with normal hearing immediately after the shooting stops.
If there's one thing the entertainment media gets wrong, and never seems to get called on it, it is the effect on hearing of gunfire, and especially gunfire in enclosed spaces.
The guns are firing blanks, and the "sound" of the gunfire is created after the fact, using various sounds to simulate (not reproduce) the sound of the shot. No recording media can accurately capture the effect of a gunshot, nor can any speaker faithfully reproduce the effect, either.
Video someone shooting, watch the tape, the gunfire is all a bunch of "pops". Bigger guns make louder pops, but that's all. Compare that to what you heard and felt when you were videoing the shooting. Quite different.