Fatty had a five-elemental spirit body type, which was the same as the river. The fact that he attracted spirit Qi so well was also helpful. The spirit Qi would take him as a part of itself, so no adverse reaction would occur. In other words, he made a great bridge for them to cross the river. That was the reason that Lonemoon gave him such a huge kick in his behind. It was an honorable reason - there was no anger involved!
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After the few of them made it across the river and through the mist, they saw a huge dense forest in front of them. There were tall trees that reached the skies everywhere they looked - they could not see the top of a singletree. Inside the forest, apart from the aura of beasts, they could also faintly feel yin Aura.