The backflow wave from the halt of the expansion of the universe (expansion backflow) is like a giant wave in the sea chasing after billions of boats on the surface.
These "boats", whether large or small, vary in size, but without exception, are all desperately avoiding the deadly assault of the expansion backflow.
However, the expansion backflow differs from ordinary waves; waves have a limit in size and can be dodged by moving to the sides or diving into the sea. In contrast, where the expansion backflow passes, nothing can survive; there is simply no space to hide. The so-called evasion is just a race against time with the expansion backflow. Those who outrun it live; those who don't, vanish from the universe!