[Sarinpa1]

So not only it does damage, it also increases damage taken for the next attack and removes your guard. That's almost crying madchop to the heavens.
Leaving defense passives untouched to avoid a free EI, (Because I don't really see why I couldn't stalemate you with my weapon when you knock aside my shield and I am not sure what else you want to justify as "defensive passive that you can't use because your just got your guard broken) ) I propose either a 1 momentum removal as "Staggering" (Two being a pretty much knockdown, unless you manage to crit with next attck, which makes it pretty damn strong) or something similiar to burn status, that your modded defense gets removed.