Board Thread:Legitimate Canon Questions/@comment-20237552-20150123005927

Just wondering what is with the sounds they make when they are about to appear. Its like a small screech and then the ball of smoke appears where they appear. Does that have anything to do with the fireflies that are part of them (perhaps that sound being of the firefly) or is it something else?

Note: I don't want a "We don't exactly know enough information to determine the answer to that question". I'm looking for some thoughtful responses to what YOU think about that sound. It can also be made a possible "Weakness" that Oni can't exactly appear in one place without alerting attention via their sound.  