He found the universal compatibility of the Life Pill Art to very impressive because he just learned about the various kinds of foundations there were.
In the Blood Skull sect alone, there are four different ways to establish one's foundation and only two of them, the Everlasting Wood Art and the Divine Lightning Armament, are supposed to be barely compatible with each other.
No one is sure that they are compatible because no one has been able to fuse the two cultivation techniques in the entire history of the sect. If he succeeds in fusing them, he will be the first to achieve it.
Yet, the Life Pill Art can work with any other type of foundation and cultivation technique for establishing a foundation. So there was no way he wasn't going to be impressed.
