I just went through that too. Though on my 4th or 5th try I did beat him. (Even on normal he's a pain to fight. Reveangeance mode is going to be hard.)
It was the stage where Armstrong in Metal Gear Rising: Revengeance throws stuff at you and you have to slash them. I'm not so good at aiming with a game pad so I kept failing the cross slashes and died all the time. It took me hours to beat him
Played Cat Mario after watching some youtuber rage over it. Needless to say, despite having watched people play and roughly knowing where the traps are, I end up giving up on the game.