The "Whale Chapter" is even more profound. It's used to consume the "force" or momentum. The force is the output of every move. It's not merely the ultimate exerted power nor it solely lies within the weapon, but it envelops the entire body, inside and out. All the places that mobilize and support loads are part of this force. As long as it exists in the move, the "Whale" can consume it entirely.
So, the premise is that the opponent must make the first move.
Moreover, the stronger and more forceful the move, the more significant impact the "Whale Chapter" will have on the person. Previously, Zhang Zongyuan's "Out of Cage" tiger move was extraordinarily forceful, with all his muscles and True Qi involved. So, it was completely devoured by the whale. Unable to replenish his strength in time, he was left in a state of exhaustion, vulnerable to being beheaded.
The same situation applies to Pei Ye at this moment.