They did not actually increase the pressure, they simply increased the density of the water, which caused Tang Yin to lose control, encountering 'water' he did not know.
At the same time they used the Law they control to escape.
He didn't know the name of that law, but from the way he saw it, he noticed that it was very similar to the Eternal Sea. That is why he thought it was the Law of the Eternal Sea.
'Amazing. I didn't think there was a Law as exclusive as that; I wonder if anyone in my world has it.' Although they had escaped him, and perhaps he could catch up with them if he chased after them, this time, he wouldn't because he was with Qingyue.
Besides, if he found them in the future, he would like to be able to investigate them to find out what kind of law those guys have.
