The city of Houston prepared a very realistic six minute video instructing people what to do should a gunman open fire in a public place. City Of Houston hide caption itoggle caption City Of Houston The Two-Way VIDEO: How To Survive An Office Shooting: Run. Hide. Fight. August 3, 2012 The city of Houston released a short six minute film instructing people what to do in case of a mass shooting in a public place. There are three basic responses: run, hide and fight the shooter.