Ben Carson giggles when he describes how he would handle a man with a gun. He would lead a gang rush of the gunman. It would look something like this.
Carson is very brave with other people's lives. Carson was never a Navy Seal or Army Ranger. He never served in the military in any capacity. When honored with the offer of a full scholarship appointment to West Point he refused it.
If faced with the situation I have no doubt Carson would be screaming for everyone to rush the gunman. But he would do it from behind, possibly hiding under a desk.