Aside from the enemy Sanctuary from a thousand years ago, the tiger-like tribes were also the main targets of the Death Knight's operation, and they wouldn't provoke Eightfold as long as Eightfold didn't provoke them first.
Their True Order wasn't limited to Xiuluman and Death Knight only; their strength wasn't as dispersed as that of Profane Blood. Most of their power lay dormant within the Capital District.
Even if the Capital District Hunters Branch wanted to eliminate them, they were unfazed, but still, the Death Knight didn't want too much friction with the Hunters Association.
Once they angered the Hunters Association, drawing out a Catastrophe Level or an encirclement by the Federal Hunters Headquarters, even they would suffer substantial losses.
Seeing that the Death Knight took the initiative, Eightfold thought for a moment, then joined the Death Knight in attacking Mother Yu Changhu and Jin Dahuo.