Another reason could be related to their different approaches to solving problems. Annabeth is very methodical and likes to plan things out, while Percy is more instinct - based. If Percy goes against Annabeth's carefully laid - out plan during a quest in the fanfiction, she might yell at him for ruining their chances of success.
Maybe it's because of a misunderstanding. In fanfiction, there could be a situation where Percy is seen with another girl in a way that Annabeth misinterprets. This could lead to her yelling at him out of jealousy or hurt feelings. Like if Percy is helping a new demigod girl and Annabeth thinks there are romantic undertones when there really aren't.
One possible reason could be Percy's recklessness. He often jumps into dangerous situations without thinking fully, and Annabeth, being the more strategic one, might get frustrated and yell at him. For example, if Percy decides to face a powerful monster alone just to prove himself, Annabeth would be worried and angry at his lack of caution.
One reason could be miscommunication. Maybe Percy misinterpreted something Annabeth said or did. For example, if Annabeth made a decision about a quest without consulting Percy, he might get angry and yell.
One possible reason could be Percy's recklessness. He often jumps into dangerous situations without fully thinking them through, and Annabeth, being the more strategic one, might get frustrated and yell at him for endangering himself and others.
Well, it could be due to a misunderstanding. Maybe Percy thought Annabeth did something wrong regarding a quest, like made a decision without consulting him. In fanfics, authors often play with such relationship dynamics.
In some fanfictions, Annabeth could abandon Percy because of a prophecy. If the prophecy seems to imply that being with Percy will lead to a great disaster, she might choose to leave to protect him or the world. Also, it could be due to a personal growth arc for Annabeth. She may realize that she has been too dependent on Percy in the past and decides to go off on her own to find her true self, leaving Percy behind.
One possible reason could be a misunderstanding. Maybe Percy did something that Annabeth misinterpreted, like being overly friendly with another character which made her jealous and led to her rejection.
One reason could be a shift in the plot where Annabeth's character development leads her to realize she and Percy are not compatible in the way they were initially thought. Maybe she has new goals or a different understanding of herself that makes her feel she's better off without Percy in the fanfiction world.
Maybe Percy has shown some uncontrollable power that scares Annabeth.
One reason could be stress. Maybe they are in a really tough situation in the fanfiction, like facing a powerful enemy. Annabeth, being under a lot of pressure, snaps at Percy if she thinks he's not taking things seriously enough. Another possibility is jealousy. If Percy gets a lot of attention from someone else, Annabeth might snap out of insecurity.
Well, one possible reason could be that Percy made a really stupid decision without consulting Annabeth first. Like, if he went off on a dangerous mission on his own when they were supposed to be a team. Annabeth is a very strategic person and she might feel betrayed or extremely frustrated by such actions.
It could also be due to some sort of magic or mind - control. A powerful enemy might have cast a spell on Annabeth, forcing her to turn against Percy. In this case, it's not really her own will but the result of external manipulation.