Well, in some versions, they might use their knowledge of the castle's secret passages to lead the troll away from Hermione. They could also work together as a team, using their Slytherin cunning to outwit the troll.
One plot idea could be that a group of Slytherins overhear some Gryffindors making cruel remarks about Hermione that border on abuse. Outraged, they step in and form a sort of protective alliance around her. They use their Slytherin cunning to outwit those who are being mean, for example, by tricking them into revealing their true nasty selves in front of the whole school. Another plot could involve a Slytherin who has secretly admired Hermione's intelligence for a long time. When he or she witnesses the abuse, they gather other like - minded Slytherins and start a campaign to change the perception of Hermione in the school. They might start by inviting her to study groups in the Slytherin common room, which is initially met with resistance but gradually changes the minds of many.
Draco Malfoy could be one of the main Slytherin characters. Despite his past differences with Hermione, he might have a change of heart when he witnesses the abuse. He could use his family's influence to stop it. Another could be Pansy Parkinson. She may initially be reluctant, but as she sees the injustice, she steps in. Maybe she uses her sharp tongue to put the abusers in their place.
Well, perhaps he uses his influence in the wizarding world. Maybe he has some connections or knowledge that allows him to intervene and get Hermione out of the abusive situation. For example, he could use his status among the pure - blood families to put pressure on the abusers.
Minerva would likely first remove Hermione from the immediate dangerous situation. She might take Hermione to her own quarters in Hogwarts, which would be a safe place. For example, she could give Hermione a warm bed to sleep in and some food, providing her with basic necessities and a sense of security.
In some fanfictions, Slytherins might protect Hermione from Ron by using their cunning. They could manipulate situations to keep Ron away from her when he's being unreasonable. For example, they might create distractions during an argument between Ron and Hermione, leading Ron astray so he forgets about his anger towards Hermione.
One great Hermione and Slytherins fanfiction is 'A Different Sort of Bond'. It explores the relationship between Hermione and a group of Slytherins in a really interesting way. The characters are well - written and it shows how Hermione can break the stereotypes associated with Gryffindors and Slytherins.
One reason could be that they see her intelligence as an asset. Hermione is known for her brilliant mind, and Slytherins, who value cunning and resourcefulness, might respect that. They could also recognize her strength in the face of adversity and be drawn to protect her as a way to show their own growth beyond the typical Slytherin - Gryffindor rivalry. In some fanfictions, a Slytherin might have a personal connection or debt to Hermione, which leads to their protective nature towards her.
One way is through magical means. Slytherins are known for their magical skills. They could cast protective spells around Hermione when Ron is in a foul mood. For instance, a spell that would make Ron unable to approach Hermione without permission. Another way is by using their knowledge of the Hogwarts layout. They could lead Hermione through secret passages away from Ron.
One possible scenario could be that in this fanfiction, Harry discovers that Hermione is being bullied by some dark - minded students at Hogwarts. He steps in immediately, using his skills and the respect he has among his peers to put an end to it. Maybe he threatens the bullies with exposure to the professors if they don't stop.