I’ve noticed sometimes while playing that it can be a little hard to tell the difference between whether I have killed a ghost or they are going back underground temporarily, and I believe it’s because when you kill a ghost it doesn’t show the red skull symbol that comes up when you kill other enemy types, and without it your kill isn’t as obvious to notice in the heat of gameplay. I’m not sure if there is a specific reason as to why this doesn’t happen or if it is an oversight, as this symbol is shown when you kill any of the other enemy types.
This is the skull symbol I am referring to.