When in Swipe Swiftly's level, when you are to fight him, jump straight up and perform a pound by pressing X in air. You will see Swipe Swiftly falling with you. When this happens, press Start to pause game play and Swipe can be seen as a blob with hair and a sword sticking out of him. He is always incomplete when he is falling. When he hits the platform, he will quickly convert to his true form.