I describe these scenarios to my young children as concentric circles. One person can be acting reasonably (small circle around them) or very badly (larger circle). A person nearby can be very resilient (small circle) or fragile (larger circle). Where the circles overlap, is when there is tension and there are fights, tears or anything else that requires me to intervene.

Obviously very bad behaviour (large circle) is going to overlap with a nearby resilient child. Or a very tired and fractious child is going to sulk by their sibling doing just about anything. But the more resilient and better behaved the combinations, the better.

If the children are fighting, I've taken to just calling out "Circles!"

Unfortunately, a polarised society and social media seem to make everyone treat interaction as war, which is pretty tedious.