...) 37 Cal.4th 453, 466.) At around midnight on June 9, 2006, Francisco Ruiz was leaving a party in a neighborhood claimed by the Westside Wilmas gang, when a car pulled up...Westside Wilmas gang, but he did not know 29-year-old Ruiz, who belonged to the same gang. Espinoza confessed to shooting, but claimed self-defense and to have believed Ruiz had been challenging the...driver of the car. According to expert testimony, even though Ruiz had shot a senior and fellow gang member, the shooting would enhance the reputation of the Westside Wilmas gang, because Ruiz was...