"Looks can and often are used to deceive." Nathanos replies simply. He takes note of Yuri's reaction, then mentally files it away.

"Besides, nobility rarely makes for a truly satisfying kill. Easy kills, more likely. Especially the foolish ones that believe their crown alone makes them invulnerable."

And yet so far he has to encounter a crown that can block the swing of a well aimed ax. Thus, Nathanos chooses not to be fooled.