Courage imo is seeing that there is Fear within you when you are face with great odds, but your conviction to the higher cause enable you to find Courage which lead you to continue the fight even though it Might as well meant the end of you, though it need not be the end of you.

Parity imo is similar to pride.. villagers are the strongest fighters in Thera, as the helpfile stated, so with so much power, they shall not except aid from anyone to win their fights, because they are the strongest of Thera. Even when facing with great odds...they should pride themselves on their ability to taking on bad odds.. and ganging just goes against all their principles... though this is unfair to them and it sucks, but if they gang, they won't be able to prove to the rest that they are truly the most powerful, famed barbarians of the village, but might be look upon as weaker and lower than an imperial slave...

I got use to the unwritten rules that if it's outside the ruins and the village, parity applies.. but that's just me...