"Mushi?" He rolls the unfamilar word around his mouth, testing the sound of it. "I've seen some around. Just thought those were will-o-wisps." And therefore, easily dismissed. One of the benefits of hunting the supernatural is a predisposition to seeing things other people can't, though it's hardly infallible. Still, he's never heard of the creatures before, so it's likely a peculiarity of another world -- much like the Pokemon -- that the Carnival has picked up on its travels.

"Seemed harmless. There a reason you don't like them?" Otherwise, why make anything designed to repel them?