Tactical use of the shotgun!
Training is the key to any tactical senario. Most people and law enforcement professionals hate to shoot heavy shotguns. So they do not train with the weapon regularly. A proper shotgun slug, used by a trained person, will end any CQB situation. A rifle bullet will pass through the target at extremely close range and most times not cause the desired effect. The shotgun slug, moving slower and with greater mass, is perfect.
It's no different than hunting any dangerous game. An aimed shot from a trained person, with the proper equipment, will usually end the threat. A charging brown bear or a crazy bad guy. Only the untrained person, thinks a shotgun slug is for Hollywood movies.