Enemy Retreating is the 5th track in the Undertale Yellow Soundtrack. It will play when Clover is encountering regular enemies on the Genocide Route.

It is confirmed that during the Genocide Route, after each kill, the song will slow down, and the pitch will drop.Citation Needed

The title of the song is a play on Enemy Approaching Yellow.

Undertale Yellow Soundtrack
1-10 Once Upon a Truthful Time • Main Menu 01 • Enemy Approaching Yellow • Fallen Down Yellow
Ruins Yellow • Howdy! • In Darkness • Main Menu 02 • Justice • Fever Pitch! • Enemy Retreating • Seclusion • Forlorn • House Guest
10-16 Enemy Retreating • Seclusion • Forlorn • House Guest • To Be Continued • Fun-Sized
Bonus Boppin'