Interview the Witness

The young woman who found the bodies was leaving the club when the attack occurred. She claims to have heard a quiet, high-pitched whistling noise, followed by gunshots and a scream. She hid for several minutes before peeking into the alleyway. Spotting the bodies, she ran back to the club and had the bouncer call the police. No one in the club heard or saw anything, and no one there knew either victim.