Thinking of Character A and B who have a troubled, dysfunctional relationship, who genuinely do care about each other's wellbeing and want to help each other but really struggle to gel well together.
Thinking about Character A relentlessly stuffing down all their feelings about every argument, every stressor, every infuriating thing B does/says, because taking care of them is more important than getting along, until something finally tips them over the edge and in a moment of blind rage they're a lot more like a whumper.
Thinking about afterward too. The first time these two abrasive personalities shrink, one shocked and scared, the other just as shocked at themself and ashamed. B knew they had their troubles but they didn't realize A hated them, much less that much. And A floundering to backpedal and fix it because they don't, they don't hate them, but is there really any coming back from what just happened?