One man between two forces using 4 principles

I would rather say one being of two forces using 4 principles (or modes of interaction). The difference is subtle but, I guess, significant because people tend to exclude themselves from the whole thing.

describe that two forces to me as you see them

I’m afraid, it’s very vague and plain: yin/yang, male/female, good ole Biblical good/evil, plus/minus, but also duality of concepts like matter/energy, inside/outside, observer/observed, etc. I think entropy/negentropy is also one of those pairs.