Kapitel 113: Klyn is growing up?

When Fu Sheng sees Klyn dropping from the castle, he wonders whether he should break this boy's legs or drowns him in the lake. Why does he never do what he asks him to do? 

Klyn might be more than two thousand years old, but he's mental age is not more than twenty years old human male. He has barely stepped into adulthood. Because he's the youngest among the nine nobles, he is treated like the youngest brother. His mistakes are often overlooked.