He's only done the fighting on a personal level like... Once in his entire existence, maybe a second time back when he was taking over. He's done the suppression thing countless times based on how many attempts failed at the spiral death machine. He'd probably just labyrinth him and bugger off, assuming he'd won. If that didn't work, he'd start sending in the mugann.
Well, that's my opinion at any rate.
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MMBN style fighting game made by me in the link below!
http://sandbox.yoyogames.com/games/184947-b8bn