The thing is that you just don’t know how you or others are going to react until it happens.
I’ve been involved in three armed robbery situations many years ago when I worked in a clearing bank.
On one occasion a man came into the branch and pointed a gun at the cashier and asked him for all his money. The cashier replied, “I haven’t got any, but he has” pointing to another cashier further down the line. The armed robber walked over to the other cashier and pointed his gun at him! No one was hurt thankfully and once the robber had left we went to find the branch manager. On trying to open his office door we found we couldn’t get in, it was locked. It became apparent that as soon as he saw his staff being threatened he RAN to his office, locked himself inside, and hid behind his desk.