Ron would be on high alert and use his instincts. If there was any sign of danger, he'd immediately step in front of Hermione and face the threat head - on. His loyalty to her would be his greatest strength in protecting her.
Ron might take Hermione to a hidden or safe place within the nightmare setting. It could be a secret room or a place only he knows about in that fictional world.
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 common theme is relationship troubles. For example, they might have trust issues where Ron doubts Hermione's loyalty or vice versa, leading to a nightmare - like state in their relationship. Another theme could be the fear of losing each other, either through death or some other means like being separated forever.
Well, there might be a 'Ron and Hermione nightmare fanfiction' where they are in an alternate reality. In this world, Ron is a Death Eater and Hermione has to fight against him. It's a total nightmare for their relationship. Or perhaps there is one where they both lose their magic in a strange accident and they struggle to cope with the Muggle world, which turns into a series of nightmares for them as they face difficulties they never thought possible.
In this fanfiction scenario, Ron could draw on his knowledge of the wizarding world. He might remember some ancient spells or potions that could safeguard Hermione. He'd be really determined to protect her. He could also call on his friends like Harry for help if the situation got really tough.
He could also be heartbroken. Ron might withdraw into himself, spending a lot of time alone in his room at the Burrow, not wanting to talk to anyone. He may start to doubt his self - worth, thinking that he wasn't good enough for Hermione.
The relationship changes drastically. Hermione may start to view Ron as someone she once knew well but has now grown apart from. Ron, on the other hand, may go through a range of emotions from denial to anger to sadness. Their friendship that was the foundation of their relationship may also be damaged, and they may have to re - evaluate how they interact with each other in the wizarding community.
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.
Perhaps she tries to find them right away. Using her intelligence and resourcefulness, she starts to search for any clues as to where they might have gone. She could ask other friends, like Neville or Luna, if they have seen Harry and Ron. And she might be determined to bring them back, not willing to give up on their friendship easily.
Ron would probably be shocked at first. He might stutter and not know what to say immediately. Then, a big grin would spread across his face as the news sinks in, and he'd pull Hermione into a tight embrace, telling her how happy he is.
The relationship between Hermione and Ron in this fanfiction takes a sharp turn. It goes from a relationship (presumably) full of the usual bickering and affection they have in the original series to a complete break - up. Hermione's feelings shift towards Bill, leaving Ron behind.