Also bonus points if the captain actually improves the situation via their lack of training.
For example encountering a race who insults one of their crew, normal starfleet captain would brush it off but fake starfleet captain challenges them to a fist fight.
Turns out the aliens greatly respect such actions and starts off first contact with a gesture of equal respect.
The man held out against an admitedly injuried Khornate berserker, he’s just got a healthy sense of self preservation and a cripling case of imposter syndrome.