 CONT: SPOILER: When the killer on the videotape in Kevins  refrigerator stops talking (ending with "no cops"), there is a nine  second delay before the bomb goes off (one second of this is in slow  motion). Later, at the police station, they are playing back the  recording that was taken over the phone at Kevins apartment. When  the killer finishes speaking this time, there is only a three second  delay before the explosion.