Lonemoon thought that Fatty could not learn how to sword-ride because he had no foundation in sword techniques. Then again, which sword cultivator did not take years and years to establish their foundation in sword techniques? They could only make use of their spirit Qi to improve their sword techniques after establishing that foundation. Since Fatty had never trained before, he was just beginning to interact with spirit Qi - much less sword Qi. That was why he could not even handle the little sword Qi that dharmic weapons contained. It was such a waste of his Nascent Soul cultivation.