The shudders of the River of Time are merely confined to a few hundred nearby universes. And only at the River of Time shores of Lin Yuan's universe is the trembling most pronounced.
As for the River of Time of the hundreds of surrounding universes? Just a slight wobble.
In fact, every newly-promoted twelve-layer ascension causes similar phenomena, only far less intense than that of Lin Yuan.
The disturbance caused by Lin Yuan's ascension exceeded the limits of his universe's River of Time, radiating influence to hundreds of neighboring universes.
This led to the shock in the hearts of the twelve-layer Ultimates within hundreds of universes, as they had not seen anyone ascending at the banks of their own universe's River of Time.
But such trembling and shaking coming from the riverbank? This was yet another sign of a new Ultimate's ascension!
...