The commanding officer of the Western Region, Wei Song, knew perfectly well why the Central Plains had given up the alliance with the Dragon King halfway through.
Revenge was a natural instinct, even more so when the dead was one's own son. If this had been the Central Plains, he would have cut Slave Huan and Zhong Heng into pieces and never let them live another day. But he was in the Western Region, and the power of the Central Plains waxed and waned. During the latter, it was weaker than an organization of killers.
When the Dragon Army gained victory in Xiaoyao Lake, he faced an awkward choice. Should he continue to ignore the existence of the Dragon Army and foster the suspicion of his colleagues in the court? Such suspicion stopped him from arguing and caused a crisis of trust. He could imagine that the Dragon King must, at this moment, be more inclined towards Norland than the Central Plains.