Billy Pilgrim has come unstuck in time.
The firestorm. The silence after the bombs. A city turned to moonscape. Billy is a prisoner of war, a witness to the end of the world.
The optometrist. The mundane suburban life. A mask of normality worn over a shattered soul. Everything is predictable, yet nothing makes sense.
They see all time simultaneously. Every single moment exists always. Death is just a bad moment in a timeless existence. "So it goes."