Phantom Vibration Syndrome occurs when a person thinks his or her phone is ringing or vibrating from a text message when it actually is not. It usually stems from overuse of electronic devices.
The episode title "What Doesn't Kill Us", is derived from a quote "What doesn't kill me, makes me stronger" by German Philosopher Friedrich Nietzsche.
Christopher Dorner was a former Navy reservist and officer of the Los Angeles Police Department who, beginning on February 3, 2013, committed a series of shootings in Orange County, Los Angeles County, Riverside County and San Bernardino County, California. Dorner killed four people: three law enforcement officers and the daughter of his former captain, he shot and wounded three others. Prior to the murders Dorner sent a manifesto to CNN declaring "unconventional and asymmetric warfare" upon the Los Angeles Police Department (LAPD), their families and their associates, unless the LAPD admitted publicly he was fired in retaliation for reporting excessive force. In 2008 Dorner was fired from the LAPD after he reported his field training officer used excessive force in an arrest, both an internal and independent investigation show no merit to his claim and he was fired for making false allegations against a fellow officer. Dorner sent his manifesto on February 1, on the 3rd he shot and killed Monica Quan, the daughter of Dorner's former lawyer who was a retired LAPD captain and her fiancé Keith Lawrence, a campus police officer at the the University of Southern California. On the 7th two officers of the neighboring Riverside Police Department were ambushed and shot by Dorner while stopped in their marked patrol unit at a red traffic light in that city. One officer, Michael Crain, died shortly after the shooting; the other was rushed to a nearby hospital in critical condition for surgery and survived. On the 12th Dorner stole a Dodge pickup near Big Bear Lake, he was spotted by Fish and Game officers who reported his location. A nearby San Bernardino County Sheriff's Department patrol car initiated a pursuit, Dorner opened fire on the two officers hitting them both and killing one: Detective Jeremiah MacKay. Additional deputies pursued Dorner to a nearby cabin where he barricaded himself inside, Dorner refused to surrender or come out, despite tear gas canisters being fired through the windows. A SWAT vehicle knocked down one of the cabin walls and shot pyrotechnic tear gas canisters into the cabin, which resulted in the cabin catching fire. Realizing he was about to be captured Dorner committed suicide by a self inflicted gunshot wound to the head.
Hogan's Alley is a Training Ground located at FBI Training Academy. It is used to teach Agents-In-Training and other law enforcement partners, latest tactical and investigative techniques as well as established standard practices in law enforcement. As for the name itself, in the mid-1920s, these training exercises performed on the shooting range came to be called "Hogan's Alleys." The name came from a comic strip in the 1890s called the Yellow Kid, which was a romanticized look at the daily life a young boy who lived in a crime-ridden New York tenement called Hogan's Alley. It is surprising that Deputy Director Bailey, who was supposedly an Agent-In Training, did not remember or undergo these exercises.