From an given point in time A a mirror horizon emerges from observer B. Nothing can escape that horizon because nothing can travel faster than the speed of light. If observer B starts to move after the given point A in any direction the mirror horizon contracts. Reflecting all energy stored at the mirror horizon inward towards observer B.
This leads directly to an ever increasing thermal energy on any given observer.

Planks shock-freeze effect. It its given as true that the substructure of time of the universe is quantized in the way Plank used to describe it then: A certain amount of time has to pass for an certain amount of time to pass. In other words we would be frozen in time.