I loved the higher difficulties on Metal Gear Rising.... except for Revengeance on Armstrong. Specifically the second part of the battle where it's a hopeless fight until Blade Wolf bails you out. I believe the cutscene to get past it is triggered either by Raiden getting hit after a relatively short timer, or by a much longer timer elapsing. However, on Revengeance Armstrong will one hit kill you with every single attack (in this section of the fight), so your only choice is to just run down the longer timer. And this amounts mainly to running away repeatedly and hoping that you don't accidentally back yourself into a corner that you can't get out of. It's pretty lame, and a shame for what is otherwise an amazing experience.