Could it be that Senior Brother Chu made a move?
But Senior Brother Chu is only at the Divine Transformation Realm, how could he possibly withstand an attack from a Hollow Void Expert?
As for the possibility of Senior Brother Chu having made a breakthrough to the Hollow Void Realm, Yu Qing didn't even dare to consider that - the last time Senior Brother Chu appeared, he was only in the late stages of the Divine Transformation, a significant gap from the Hollow Void Realm.
No matter how talented Senior Brother Chu is, or how favorable his opportunities might be, it's impossible for him to break through from the late stage of Divine Transformation to the Hollow Void Realm.
In the history of the Northern Boundary, no one has ever done this, because there is no opportunity that could allow a cultivator to step into the Hollow Void in one leap from Divine Transformation.