Snape could act as a mediator in a way. He might not directly tell Ron to stop pursuing Harry romantically. Instead, he could guide Ron to understand the importance of their friendship first. He could remind Ron of all the adventures and challenges they've been through together as friends and how a romantic relationship could potentially ruin that. By doing this, Snape is essentially saving Harry from an unwanted romantic entanglement with Ron.
He might be the unexpected protector. While Snape has always had a complex relationship with Harry, in this context, he could be the one to shield Harry from Ron's overzealous romantic intentions. He could use his knowledge of magic and his influence in the wizarding world to keep Ron at bay. For instance, he could use spells to make Ron forget or at least suppress his romantic feelings for a while. This would give Harry the time and space to figure out his own feelings and what he really wants without the pressure from Ron.
Snape could be the voice of reason. He might see the potential chaos and damage that a romantic relationship between Ron and Harry could cause, not only to their friendship but also to the whole Hogwarts dynamic. So he steps in to prevent it.
Well, perhaps Snape could use his authority as a teacher. He might see Ron being too pushy or possessive towards Harry in a romantic sense and intervene by giving Ron extra assignments or detentions to keep him away from Harry.
One reason could be Snape's sense of justice. Despite his often - cold exterior, he may not tolerate Ron's unjust behavior towards Hermione. Another reason might be that he sees something in Hermione that he values, like her intelligence or her thirst for knowledge, and doesn't want it to be extinguished by Ron's actions.
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.
After saving Harry, Snape may have to deal with a lot of mistrust from some people in Hogwarts who don't understand his motives. However, he might also start to form a closer bond with Harry, which could change the whole dynamic between them. This new relationship could lead to some unexpected alliances and enmities within the wizarding world. And if the Dursleys were to try and retaliate, Snape would have to constantly be on guard to protect Harry from any potential harm they could cause.
There could be far - reaching consequences. For one, it might lead to a re - evaluation of relationships all around. Hermione might be caught in the middle, trying to understand Draco's motives and also keep the peace between Ron and Harry. In the wizarding community at large, the news could spread and cause different reactions. Some might praise Draco for his unexpected act of kindness, while others might be suspicious of his intentions. And for Harry and Ron's friendship, it could either be mended in a new way if they can get over this situation, or it could be permanently damaged, depending on how they handle the aftermath of Draco's interference.
In this fan fiction scenario, Snape might use his knowledge of the Muggle world and Vernon's weaknesses. Snape could have found out some information about Vernon's business affairs or personal secrets. Then he blackmails Vernon into leaving Harry alone. By doing this, he effectively saves Harry from Vernon without having to use too much magic and draw unwanted attention.
Another possibility is that Snape uses his position as a teacher. He might threaten Lockhart with the consequences of harming a student. Given Snape's intimidating presence and his own power within the school, Lockhart would be afraid to cross him. Snape could also call for other teachers to help, making it clear that he won't let Lockhart get away with any harm to Harry.
Well, in some fanfictions, Draco might save Harry from a Ron romance situation because he has his own reasons. Maybe he realizes that Harry is in an uncomfortable position with Ron's new - found romantic interest and decides to step in out of a sense of fairness or a new - found respect for Harry. It could also be that Draco has some ulterior motives, like he wants to use this opportunity to get closer to Harry for his own gain, perhaps in the power struggle within the wizarding world.
Perhaps Snape uses magic to create a distraction at the Dursleys' place. He could make strange noises or apparitions that scare the Dursleys, and while they are in a panic, he grabs Harry and disapparates. This would be a quick and efficient way for him to rescue Harry.
In this type of fanfiction, Snape could simply intimidate Vernon. Snape has an air of mystery and a certain power about him. He might show up at Vernon's doorstep, give Vernon a cold stare, and with his reputation as a powerful wizard, Vernon might be too scared to oppose him. Snape could then just take Harry without much resistance from Vernon.