The fourth spell enables the use of an external body as a decoy, diverting the actual "la la la la" from the mouth. This serves as a trump card in evasion, allowing the caster to withstand the impact of even the legendary "la la la la."
Heath Ledger. Comics were good, buT he became the joker.
Also, the Psychopathic tendencies and the clear insanity. Talking to myself and answering was normal, making jokes and laughing at them was par for the course. Does that make me the Joker? Hopefully, the comic one. The Movie one was just sad.