Friend of mine is a pround gun owner, conceal to carry, has taken classes and goes to the range every other weekend to keep her skills honed. We even joke in a group that they will save us should a bad thing begin.
One day they were in a department store and there was the sound of gunfire. They told me how it was so much different than the drills and the practice. That when it actually happened all they wanted to do was grab the people near and hide with them behind some shelves, then take the first opportunity to exit. In the end, it was not gunfire but some sort of mechanical mishap that made those bangs.