The End, the Beginning - S9.E31

Goku tries to convince Tajoro to extinguish the flame long enough to fix the leak that causes the Ox King's castle to ignite, but she refuses. This is because the flame is what creates the fog that shrouds Mt. Five Elements, and the fog is what allows spirits to pass between the spirit world and the world of the living--without it, no spirit could ever visit the world of the living again, and all spirits already in the world of the living would be trapped forever. Therefore, they must find another way to put out the flame at the Ox King's castle.