One reason could be that they might have different interpretations of Harry's character in the fanfiction. Hermione, being logical, may see Harry in a more practical light, while Ron, with his emotional side, could have a different view.
The Weasley twins would likely make light of the situation at first. They might crack some jokes to ease the tension. But they would also use their own experiences to tell Harry and Ron that fighting over small things isn't worth it and that they should patch things up quickly.
Hermione could also start the fight. If Ron makes a comment that she perceives as sexist or demeaning to her intelligence, she won't hold back and will start an argument. For example, if Ron says something like 'Girls should focus more on house - work magic than advanced spells' in a joking but wrong - headed way.
One possible reason could be jealousy. Maybe Ron is jealous of Harry's fame and the attention he gets. Another reason might be a misunderstanding. For example, if Harry makes a decision without consulting Ron in a crucial situation, Ron could feel left out and get angry, leading to a fight.
One reason could be jealousy. Maybe Ron feels that Harry is getting too close to Hermione and he's afraid of losing her attention. In fanfiction, authors often play with the characters' emotions. Harry, on the other hand, might see Ron as being too possessive of Hermione.
They could each write their own version of the fanfiction based on their ideas and then combine the best parts. This way, they both get to have their say in how Harry is presented and what happens in the story, and it could lead to a more interesting and inclusive fanfiction in the end.
The fight could also make them re - evaluate their relationship with Hermione and each other. They might realize that they've been taking their friendship for granted. For instance, Harry might think about how important Ron is to him, not just as a friend but also as someone who has always been there, and the same for Ron. And they'll have to work hard to repair their friendship.
Another possibility is that in the fanfic's unique plot, there could be some sort of magical influence or dark magic at play. Perhaps a spell was cast on Ron that made him act out of character and punch Harry. It could also be part of a complex plot where Ron is being controlled by an outside force to create drama between him and Harry in the context of the Drarry relationship.
It could also lead to a divide within their group of friends. Hermione, for instance, might be caught in the middle, not knowing who to side with. This could create a lot of tension and conflict among the characters, adding more drama to the fanfic. If the punch was public, it could also damage Ron's reputation among their peers, as punching a friend is not an acceptable behavior in most cases.
In some Harry Potter fanfiction, Ron's muscles might be emphasized in various ways. For example, in a story where the trio has to face a physical challenge, Ron could suddenly show off his unexpected strength due to his well - developed muscles. Maybe he has been secretly training during their time at Hogwarts, and this newfound strength helps them get out of a tight situation.