Papyrus: BEHOLD, MY SPECIAL ATTACK. NYEH HEH HEH (the dog absorbed the attack) Papyrus: OK THEN... JUST USE A REGULAR ATTACK (the dog absorbed the attack) Papyrus: ILL THEN UHH... IM OUT OF BONES... (the dog absorbed the papyrus... and the rest of the underground)
FUN FACT! This song you are hearing is the extended mix of bonetrousle. It was used in the trailer for undertale, but sadly it wasn't in the official game.
