Absent from the scene, but his favorite Limp Bizkit song is what the system plays over the massacre.
When the world froze a second time and music blasted across the world on its own, Carl recognized "Break Stuff" by Limp Bizkit because it was one of Monobrow Sam's favorites.
The recognition is a small human beat in the middle of the War Crime, connecting the horror above Shanty Town to a friend's taste in music while Princess Donut's Astral Paw came down.
Offscreen friend whose musical taste lets Carl place the massacre's soundtrack.