In the Saltpeter cave, only fire attacks are allowed in most spots. However if you’re near one of the many rivers in this cave you can use water.
So I assume the game just reads it as any time (whether you’re on land or cave or whatever) you are within two spaces of the water, you can use water tactics.
Welcome to Lord Yuan Shu Walkthrough Guides ·
Huo Hu's Adventure started Destiny of an Emperor hacking