I think a nice band-aid fix that'd impact almost nothing else negatively would be to change Chi and Jin's single use Mudra to Raiton and Suiton respectively, especially since Suiton will presumably be the only long Mudra used in combat constantly. Probably not their intent to make their mythical Ninjutsu system a one press system for the majority of the fights, but I doubt having NA/EU players losing a couple of seconds for no reason throughout a fight was their intent either.