One possible motivation could be that Draco has changed. He might have seen the error of his ways and decided to do the right thing. Another motivation could be that he has feelings for Hermione, even if they are not fully realized yet. He doesn't want to see her in a bad situation, so he steps in.
Well, it could completely shift the relationships in the story. Instead of Hermione being in a difficult situation with Ron, she now has an unexpected ally in Draco. This might lead to a new friendship or even a different kind of relationship between them. It could also make Ron realize his mistakes if he was indeed being abusive in the fanfiction.
Draco might be motivated by jealousy. He could be jealous of Ron and Hermione's friendship or a possible romantic relationship between them. So he tries to harm Hermione out of spite.
Well, in some versions, Ron might use his quick wit and knowledge of Hogwarts' secret passages to outmaneuver Draco. He could lead Hermione to safety through a passage that Draco doesn't know about.
One possible scenario could be that Ron says something really mean to Hermione during an argument, and Draco, who has secretly been observing Hermione's intelligence and kindness, steps in to defend her. Maybe he uses his quick wit to shut Ron down verbally.
Over time, if the fanfiction progresses, Hermione could become a sort of bridge between Ron and Draco. She might encourage them to get along, now that Draco has shown that he can be on Hermione's side. Draco might also start to see Ron in a different way, realizing that Ron's jealousy or rudeness towards Hermione was born out of his own insecurities. This could potentially lead to a more complex and interesting dynamic between the three of them.
Charlie might be a character who has known Hermione for a long time, maybe through some other connections in the wizarding world. He sees Hermione as someone in need of protection from Ron, whether Ron is acting out of his own accord or is being influenced by external forces. In relation to Ron, he is the one who stands against Ron's actions towards Hermione.
In many fanfictions where Ron saves Hermione from Cormac, it often showcases Ron's protective side. Maybe Cormac was being too pushy or overbearing towards Hermione, and Ron steps in. It could be a moment that solidifies their relationship in the fan - made story, showing that Ron truly cares for Hermione and is willing to put himself in a difficult situation to protect her.
Well, it could be that Lucius uses his powerful influence in the wizarding world. Maybe he intimidates Ron with threats related to his family's status or he uses some dark magic to create a distraction and whisk Hermione away.
Well, it could be that Snape has been secretly observing Ron's erratic behavior towards Hermione. When the situation gets out of hand, he intervenes. He might use his position as a teacher to discipline Ron and in the process, saves Hermione. Snape is a complex character with a lot of power and knowledge, so he could use various means like his occlumency skills to sense the danger Hermione is in and act accordingly.