Place it just after a name reveal in your edit, then follow with Enemy Spotted as the next beat, and save Inception Horn for the bigger twist that follows the discovery.
このサウンドについて
This is a very short spoken line from Flowery in Deltarune Chapter 5, lasting about a second and a half, delivered in a calm, knowing voice that turns a simple observation about names into a pointed remark. It feels sly and quietly unsettling, like a character who already understands more than they are saying, and it works best as a knowing aside rather than a loud joke.