[ Sebastian's serious expression lightens in interest, since that's interesting and unexpected. The idea itself isn't foreign to him, since an object taking life was a common idea in stories, but he hadn't thought it was something real. Even a demon didn't have full knowledge of the supernatural, funnily enough.

It's also what leads him to a slight misunderstanding, because a spirit as he understands it tends to carry a slightly different connotation than it does in the East. A spirit of a blade is probably closer to what he is, he thinks, for any weapon of war would not exactly be benevolent... Or so he assumes. ]

A blade... I admit, I am surprised. I have never encountered such a person before.

[ He still sounds thoughtful, but not quite confused. That comes as he hesitantly starts to ask another question: ]

I apologize, but is that something I should have noticed sooner?