Thanks so much ... that's extremely helpful though it might take some unpacking ...
Okay thinking aloud: I have a point in my story where my two recently orphaned teenagers (sister and brother, MC and IC) are about to kicked out of their unstable and dangerous benefactor's home. The storyform's RS issue at this point is Worry, counterpoint Confidence. So the way I kind of have it now is that the MC is so worried about what will become of them that she is willing to sacrifice principles (and lie) to stay with the benefactor, whereas the IC is suggesting that she should have the confidence to stand up for truth and principle.
So you could say "the relationship between brother and sister is threatened by the tension between worry and confidence." And actually, when I put it that way, it wouldn't necessarily have to be about worry about leaving vs confidence about leaving, it could be where do you put your worry or confidence? (staying vs. leaving).
Meanwhile at around the same point, I have an IC story point of Understanding as Relates to Destiny. So here I've written "Mubin (the IC) says to her: "Don't you understand? Everything has changed for us, no matter how much we want it to be the same."
But couldn't those two points just be rephrased and reversed? ie "their relationship is threatened by their different understanding of their destiny" and "Mubin says to her, 'you have too much confidence in staying, but that's what you should be worried about.'
Sorry if I'm being unclear. And actually, I like all of those points I just wrote -- I could put them all in! -- but I'm just afraid I'm missing something crucial in the distinction.
This is brilliant -- I'll need to post that to my wall or something to remember.