[What she finds is probably something like intense amounts of spiritual energy, a result of the sensitivity to Seraphim and the artes he's capable of back home, the pact with Lailah that gives him powers to fuse with her and the other seraphs traveling with him.
He, on the other hand? Clueless to the word she uses.]
My... ki? I'm not sure! I guess I don't really know what that means.