There are many instances in the world when one is left with no choice, embodying the idea that the ideals of loyalty and filial piety cannot both be satisfied. It means that when one reaches a certain status, personal concerns become increasingly insignificant. The scale by which one measures decisions undergoes drastic changes. Oftentimes, it is not that people change, but their position changes, necessitating a change in considerations. This is simply what is meant by acting according to circumstances.
In that situation, the raging floods were the only way to confine the Mi Clan in the Fierce Realm of South Ridge. And in the entirety of Longzhou, there weren't many who could erode three large mountains without anyone noticing.
