To be fair, I had a feeling that he didn't realize just how loud it was going to be, or at least never fired it at an indoor range. He looked kind of shaken up by that shot too. But he did keep firing, and everyone left. My teeth ache just remembering it.Similar experiences. People that are that discourteous, worry me about owning firearms.
All my 'short' AR's are either suppressed and/or have a forward blast diverter/linear comp for both me as well as others at the range. Even my 16" one tat has a brake, it's an AAC unit which I can attach either my suppressor or a flash can over it.