In Albus mode, the fight against posssessed Albus (the second-to-last boss before going to Dracula's Castle) becomes this because not only is Albus fighting himself, but for some reason, they have different names for the same attacks. It sounds like they're trying to assert the proper names for their moves!
Boss Albus: "VERTICAL SHOT!" Player Albus: "OPTICAL SHOT!" Boss Albus: "VERTICAL SHOT!" Player Albus: "OPTICAL SHOT!"