As the group stands in the alley debating what to do with the dead bodies, they hear a noise from one end. As they turn and look they see a young boy staring wide-eyed, one hand over his mouth in an unsuccessful attempt to stifle his gasp. After a second of staring at each other, the boy turns and takes off running down the street screaming, "Help! Killers! Monsters! Help!"
You're not sure what the response time is for the local watch patrol, but you guess it won't be long.