After he is handed the gun by Raymond, Meursault makes these remarks.
But we just stood there motionless, as if everything had closed in around us. We stared at each other without blinking, and everything came to a stop between the sea, the sand, and the sun, and the double silence of the flute and the water. It was then I realized that you could either shoot or not shoot.
What significance does Meursault's realization have in the overall scope of the novel?