well,it depends on how the playre plays!!!!the worst thing i did to nina by using dragunov was:she attacked sergei and he dodged it, befor she was going to find out what's going on,dragunov jumped on her and broke her neck an than K.O!!!(approaching from behind!!)beautiful, eh?
I`m not trying to say that Sergei is worse character than Nina. In real fight, in fact, his weight, height and fighting style are his advantages, and, maybe, even Nina`s speed and dexterity will not be helpful. But it is hard to make any prognoses, because everything can happen during the fight. Or not fight, yeah (Yes, in my opinion we should look at them not as at Tekken`s characters which are able only to fight in game under the direction of player, but as at real persons with mentioned fighting styles and skills) By the way, I think that this situation doesn`t need players` intervention. Let them solve the problem themselves