In my version of the fanfic, Harry was in the Gryffindor common room when he noticed Ron's strange behavior towards Hermione. Ron seemed to be in a trance and was about to lash out at Hermione. Without hesitation, Harry jumps in front of Hermione and uses a Patronus charm to repel Ron. The Patronus, in the form of a stag, charges at Ron and knocks him back. Harry then holds Hermione's hand and leads her through the secret passages of Hogwarts. As they run, Harry tells Hermione that they need to find a way to break whatever spell or curse is on Ron. They end up in Dumbledore's old office, where they start to search for answers in the old books and magical artifacts left behind.
One possible plot could be that in a dark and alternate version of the wizarding world, Ron has been influenced by some dark magic or a powerful enemy who has turned him against Hermione. Lucius, for his own reasons (maybe to redeem himself or because he sees the value in Hermione), steps in to save her. He might use his powerful family connections and knowledge of dark magic to counter whatever threat Ron poses.
In the fanfic, Harry could be alerted to the situation by his magical intuition. He arrives just in time to see Ron raise his wand at Hermione. Harry, having practiced his dueling skills, quickly deflects Ron's spell and counter - attacks with a binding spell. He then pulls Hermione away from the scene. As they flee, Harry tells Hermione that they need to find a way to remove the negative energy that has seemingly taken over Ron. They might decide to go to the library to research on ancient spells that could help in such a situation.
Maybe Harry uses his magic skills to immobilize Ron. He could cast a spell like 'Petrificus Totalus' on Ron right when he's about to attack Hermione, thus stopping the beating.
Well, it could be related to Ron's insecurities. He might be insecure about his place in the group with Harry and Hermione. Hermione is always so confident and sure of herself, and Ron might feel that he doesn't measure up. This could translate into aggression as a way of lashing out. Also, perhaps there's some external influence, like a dark magic object that's affecting Ron's mood and behavior towards Hermione.
Maybe Lucius wants to gain an advantage. He could see Hermione as a powerful witch with knowledge that he can use for his own ends. By saving her from Ron's beaten, he hopes to earn her gratitude and get access to her skills or information.
Hermione might become more distrustful of Ron. After being saved by Lucius from Ron, she could start to see Ron in a different light, perhaps as someone with a darker side she hadn't fully recognized before. This could make her more cautious in her interactions with him.
In the fanfic, perhaps there was some deep - seated jealousy in Ron. He might have felt overshadowed by Hermione's intelligence and Harry's fame for a long time, and it all just boiled over in this really wrong way.
Well, he could use his magic skills. Maybe he casts a powerful spell on Ron to stop him and then takes Hermione to a safe place, like Hogwarts where there are protective enchantments.
One common theme is friendship. Harry's act of saving Hermione emphasizes his loyalty and deep friendship towards her. It shows that he values her more than just a fellow Gryffindor or classmate.
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.