Magus Xion explained that even though it had some applications in swordplay, the new technique Emery had and utilized was not a sword technique. His master was a renowned magus and a sword expert, so there was little doubt about the information.
"What you have shown me just now is more akin to a concept. It was not a sword art."
Master Xion was able to quickly guess that the technique Emey used was his own creation, and that he did not learn it from someone, which was partially true as although he did come up with his own variant, he still based it off from the swordsmanship the two Han swordsmen displayed.
It was as his master stated, it was a skill made up from his observation and his understanding of the Dao. Therefore, calling a concept wasn't exactly inaccurate.
