The stunlock in this game is total trash.
I started a new game, and because of a jump kick combo I did by accident, I was knocked down (in a single hit, no less). Two enemies jumped me causing the 'tap z' bar to take more than 50% of my health before I could empty it tapping as quickly as I could. The damn bar kept randomly refilling, too. Making it that much harder to empty. When they let me go, this knocked me to the ground. Starting the whole enemy grab over.
So don't ever get knocked down or you may as well reset, apparently.
Edit: Is there a 'surrender' button to speed up how freaking slow the enemy grapples are? Something to make me drop to 0, maybe?