Due to the scarcity of information about the Demon Race, Su Xin's understanding of them indeed was not as extensive as that of the various clans in the northwest.
But seeing a living demon in action this time, Su Xin felt a sense of déjà vu.
The path of martial arts did not arise out of nothing; its earliest parts were created by the human race imitating the Demon Race.
For example, the Dragon Tiger Secret Way Sutra that Lu Zonghai displayed was based on the powers of the dragon and the tiger, and it must have involved parts of the Demon Race's cultivation techniques.
Thus, the power of the Demon Race and human cultivation techniques could actually be considered to have the same origin.
Of course, at the moment, everyone's attention was on that scene, and no one else felt quite as sentimental as Su Xin.