Ultrasonic motion detectors note any Doppler shifts caused by a moving intruder. Routier told authorities that the crime was perpetrated by an unidentified intruder. Such behavior may be accompanied by wing slap against the threatening intruder. She was presumed to have surprised an intruder, who then killed her. Brenner is attacked by an intruder who removes the video tapes. Abul Fazl writes that Salim caught the man but was himself mistaken for the intruder. Leslie shoots Lee as an intruder at his office. Ritualized aggression often ends by one of the animals fleeing (generally the intruder). The ringing phone gives her location away to the intruder. Air Base and continued its daylight as well as night intruder missions. The intruder, a middle aged man, remains unidentified. They are interrupted by the sound of an intruder. Time spent patrolling increases as number of the intruder interactions increases. To date the identity of the intruder has not been confirmed. The F-82s began flying strike and escort missions, along with night intruder sorties.