Apart from cultivation, Song Cheng was constantly worried about one thing: could the Ghost Servants be waiting for an opportunity?
Would they first release some weaker Ghost Servants to lull Lady Zhushan into a false sense of security, then, while she was not paying attention, suddenly unleash a wave of "trump card Ghost Servants" to quickly behead her with the momentum of thunder and lightning, before proceeding to destroy the Soul Refiners of the Prefectural City?
If he controlled the Ghost Servants, that's what he would do.
However, even if the Ghost Servants did this, there should still be some room for flexibility, because his strength certainly wasn't accounted for.
After all, he was so inconspicuous, just a blind man who happened to be at the "Form" Realm.
This "information gap" was enough to compensate for that risk.
But Song Cheng waited and waited...
The Ghost Servants came less and less.