If someone constrain me to build my bad Karma or it wouln't be Karma? If someone building their bad Karma by manipulating against me and if I've do something for revenge then It'd be my bad karma or wouldn't considered as Karma? Or It'd be same as "The Lady and the Ogress - Dhammapada Stories." Not in other, next life but in this life.
If due to some contain you cannot follow through with your action this does not become a potent karma with the potential to give rebirth but the volition forms a mild karma which can give result after rebirth.

Regardless of if you follow through with a action of intend to do some action as retaliatory or not, action and intention will become karma.