Visual and aural emitters and methods of providing a building security system distracting to an armed assailant are provided. More particularly, a permanent and fixed installation of stroboscopic lights and aural sirens that operate at sufficient and appropriate frequency, duration and intensity to potentially impair an armed assailant while remaining non-injurious and nonlethal. The system may deliver sufficient sensory distraction such that all occupants of the space are impaired in their ability to perform certain tasks employing vision or hearing with cognitive clarity, including targeting victims with a firearm. The system may be activated manually by authorized personnel, automatically by one or more sensor triggers, or remotely by law enforcement officials.