Final answer:
The phrase "When that happens" generally signifies a pivotal moment or change in a character's emotions or circumstances within a narrative.
Step-by-step explanation:
The phrase "When that happens" in literature could refer to multiple scenarios. Often, it is a point of change in a character's emotion or situation, marking a significant moment in the narrative. The context provided in the examples suggests a turning point in character dynamics or events. These phrases highlight moments when there is a shift in a character's experience, such as going from a moody depression to a more vulnerable state, reacting to a new dilemma, or facing a challenge that tests one's character.