Before they reached Ghost Gate Gorge, Tang Ye released the Black Dragon.
He said to the Black Dragon, "I don't know what kind of monster is hiding underneath that vortex, but since you can't beat it, I definitely can't beat it either, so let's not provoke it for now. First, let's collect the Power of the Crouching Dragon, and once you become strong enough with the Power of the Crouching Dragon, then we can contend with the monster beneath the vortex."
The Black Dragon had been sent flying by the mysterious entity under the Ghost Gate Whirlpool last time and was quite temperamental right now, for it was a Divine Dragon with considerable pride. But Tang Ye made sense, and the Black Dragon knew that the being under the vortex was something it, as a nascent Divine Dragon, could not match. It could only whine twice to indicate it would listen to Tang Ye.