Tan Shuchang entered the Banhu Realm, traversed the Long River of Time, recovered the accidentally altered past, and fully displayed the unthinkable capabilities of the Banhu Realm. At this point, his former cultivation wishes were also fully realized.
He forcefully took "Su" as his disciple and sent him to the Five Layers World, firstly to vent on behalf of his younger self, and secondly to lay the groundwork for taking action.
A self-restricting Banhu Realm was not something that Tan Shuchang took seriously.
However, for two cultivators in the Banhu Realm to start a conflict, they could not simply show up at each other's doorstep. Unless one could suppress the other by their realm, they would need to wait a long time until the right moment appeared.
As for why this was so, Tan Shuchang did not know.
