As Xie Yun suggested, he and his master tried to change each other's vessels. At this moment, it can be said that the two of them can control their former vessels more than their new ones. After all, one was born and lived his life as a beast king while the other hid among the humans and pretended to be using his master's original vessel.
The exchange between them is through bumping each other's forehead and wishing for them to exchange bodies. Though it makes one dizzy on their first try, they get used to it after trying it a few times. With Xie Hei back to his body as the Beast King, with him leading the group, they moved faster and no longer had to stop for Xie Hei to check the route.
However, when they are about to reach the end of the tunnel, Xie Hei abruptly stops the group.
Xie Yun , riding on his back, asked, "What's wrong?"
