as the particles collapse and gain greater speed after the collisions, the rays bend away from the respective normals at the point of collision. The rays act as an intervening medium in each others path. Each ray provides the energy needed for the collapse, but the ray does not refract again when it emerge from each other.
Does the rays deflect further from the collisions? No, ever seen two rays disperse each other?
The rays trigger the collapse in each other.
