One interesting Snape - injured fanfiction is 'The Wounded Professor' on FanFiction.net. It details his recovery after a particularly nasty hex from a mysterious assailant.
One common theme is redemption. When Snape is injured, it often becomes a catalyst for him to re - evaluate his life and actions, leading to a path of redemption. Another theme is the exploration of his relationships. His injury can bring out different reactions from his friends, foes, and those in between.
Well, in Snape - injured fanfiction, there are often different scenarios. For example, he could be injured while protecting students from a dark magic attack at Hogwarts. The stories might also delve into how his injury affects his relationships with other characters, like Harry. Maybe Harry starts to see Snape in a new light, realizing that there's more to him than just a strict teacher.
In this kind of fanfiction scenario, Snape might initially be conflicted. On one hand, he has his long - standing dislike for James Potter, Harry's father. But on the other, his sense of duty as a Hogwarts professor could kick in. He might reluctantly start to heal Harry, all the while muttering under his breath about how much trouble Harry always seems to get into, just like his father. Then, as he heals Harry, he might start to see some of Lily, Harry's mother, in him and soften a bit.
One possible fanfiction could involve Snape getting injured by a spell gone wrong during an Order meeting. Maybe a new member accidentally casts a hex in his direction. His injury could then lead to a series of events where the Order has to figure out if it was truly an accident or a sign of a spy within their ranks.
There's a great piece called 'Injured Snape: A Hidden Side'. This fanfiction shows a different aspect of Snape when he is injured. It not only deals with his physical wounds but also his psychological state. The author does a wonderful job of exploring his character in this vulnerable state. It's a must - read for Snape fans.
Snape would probably be very cold and indifferent at first. He might even think it's some sort of Gryffindor ploy to get his attention or make him look bad. He has always had a low opinion of Hermione's house, so his initial reaction would be guarded.
The plot could be that Snape is injured by a dark magic artifact that was being examined at the Order meeting. This injury could make him vulnerable and force him to rely on others, which is a big change for his character. It could also create a rift in the Order as some believe he brought the danger upon himself.
Perhaps Hermione is injured in a fight against dark wizards while on a secret mission. Snape discovers her and, despite their past differences, decides to help. He uses his skills in dark magic knowledge to counteract the dark spells that have injured her. This could lead to a begrudging respect between them as they work together to heal her and keep the situation a secret from other Hogwarts students and staff.
He could be suspected by Voldemort. Since Voldemort is very paranoid, an injury at a meeting might make him think Snape is up to something or being careless in a way that could endanger their plans.