How do references to the sun obscure our understanding of the shooting? What other possible explanations does the sun's constant presence undercut?

The sun's negative, blinding attributes reappear as the three men walk together along the beach. Meursault nearly stops listening to them talk because the sun's weight makes him so sleepy. Camus uses terms such as "unbearable","hard to breath", and "red" to describe the damage the sun is doing to Meursault. He feels beaten down. At this point, paralleling the sun struck moment outside of the apartment building in the morning, the men notice the Arabs. Meursault agrees to stand aside in case a third Arab comes because he has no reason not to agree.