Chen Jie had revealed his mastery of the Seventeen Dragon Capturing Palms for several reasons, three main ones in fact.
Firstly, Nan Batian had suddenly unleashed full power, causing the situation to spiral out of control. If Chen Jie didn't want to expose the Seventeen Dragon Capturing Palms, he would likely have to suffer serious injuries.
Rather be seriously injured than use the Seventeen Dragon Capturing Palms? That's like playing landlord with two kings in hand and yet being mercilessly defeated—an utterly suffocating feeling!
Secondly, Chen Jie realized that as his realm progressed and his martial skill improved, his other martial arts, like the Stone Breaking Hand, were no longer cutting it; the Water Manipulation Palm couldn't keep up with his current combat rhythm either.
Now, the only technique he could rely on was the Seventeen Dragon Capturing Palms.
