The Death Eater might start to question their own beliefs. Their admiration for Hermione could make them realize that the values of the Death Eaters are not as great as they thought. This internal conflict could add a lot of depth to the plot as they struggle between their loyalty to the Dark Lord and their newfound respect for Hermione. For example, they might start to secretly help Hermione and her friends, or at least not oppose them as vehemently as before. This would create a whole new set of challenges and opportunities for the characters in the fanfiction.
It could lead to an unexpected alliance. If a Death Eater is impressed by Hermione, they might decide to work with her side for a while, which would completely change the power dynamics in the story.
In some fanfictions, Hermione might show extraordinary courage and intelligence when facing the Death Eaters. For example, she could outwit them in a battle of wits or a dangerous situation. This display of her qualities could impress a Death Eater who values such traits, even if they are on the opposite side. Also, if she were to come up with a new form of magic or a solution to a long - standing magical problem that the Death Eaters secretly wished they had thought of, that would surely impress them.
The wizarding world would likely be shocked. Hermione has always been seen as a defender of the light and the rules. Helping a Death Eater would make many people question her motives and loyalty. Some might think she has turned to the dark side.
Over time, if she couldn't immediately escape, Hermione would try to influence the Death Eater. She would use her knowledge and strong moral compass to show him the error of his ways. She might start by having debates with him about the Dark Arts and the ideology of the Death Eaters, hoping to make him see the light.
She could also try to reason with the Death Eater. Hermione is known for her intelligence and ability to think on her feet. She might try to appeal to any sense of humanity the Death Eater might have, reminding him of the consequences of following Voldemort's evil path.
Well, it could be that Draco is forced to follow the Death Eater path while Hermione is fighting against them. But then, they might get thrown into some situations together, like being trapped in a place. Draco realizes that Hermione is not just a Mudblood in the sense that he was taught, and they start to form an unlikely bond. Their relationship could be full of tension, with Hermione constantly trying to convert Draco or at least make him see the wrong in what he's doing, and Draco struggling between his loyalty to his family's Death Eater ideals and his growing feelings for Hermione.
In some fanfictions, Hermione as a Death Eater is a very interesting and often controversial portrayal. Sometimes, it might show her being forced into the role due to some dark magic or blackmail. This completely flips her good - girl image from the original series and allows for a very different exploration of her character.
It might be portrayed as a tense encounter. Hermione would be on her guard, ready to use her magic if necessary. The Death Eater, on the other hand, could be sneering and full of dark arrogance.
Hermione would likely try to outwit them. She has a sharp mind. She might use her knowledge of magic, both dark and light, to find ways to counter the Death Eaters. For example, she could use spells that they wouldn't expect or find loopholes in their dark magic.
If they react positively, Hermione might become more confident. She'd feel supported and be able to focus more on her studies and adventures at Hogwarts without the worry of hiding her world from her parents. For example, she could be more open to trying new magic spells or taking part in more dangerous quests.
Hermione would use her vast knowledge of magic. For example, she could use concealment charms to hide the Death Eater from other Death Eaters who might be looking for him. Also, she might use polyjuice potion to disguise him if they need to move around in public.