Well, one possibility is that his team members go into a full - on investigation mode to find out who shot him. They might follow some leads that initially seem promising but turn out to be dead - ends. Meanwhile, McGee could be in a critical condition in the hospital, with his life hanging by a thread, and his friends are all worried sick about him.
It could be a former criminal that McGee helped put away. They might have escaped from prison and are seeking revenge on him for ruining their life.
Perhaps McGee gets hurt while trying to protect a key witness. His injury could lead to a series of self - doubts as he recovers. Meanwhile, the team struggles to keep the witness safe without McGee's usual expertise. This could also be a chance for other characters to step up and show their loyalty to McGee.
Obviously, McGee is the central character as he's the one getting hurt. Gibbs would surely be involved. He'd be the one leading the investigation into McGee's injury, using his no - nonsense approach. DiNozzo would also be there, probably cracking some inappropriate jokes at first to lighten the mood but then getting serious as the situation unfolds.
Another plot twist could be that the shooter has a personal vendetta against Callen, but it's based on a misunderstanding. As Callen lies injured, the team discovers that the shooter thought Callen was responsible for something he didn't do. This could lead to a redemption arc for the shooter and a new friendship or alliance in the end.
Well, perhaps a new character introduced in the fanfiction. Maybe a spy from a rival agency who sees Abby as a threat to their mission. Or it could be an associate of a major criminal that the NCIS has been investigating. They might think that by shooting Abby, they can disrupt the investigation. Also, it's possible that it's a person with a personal vendetta against Abby, like someone she unknowingly wronged in the past.
One possible plot twist could be that the shot was a setup within the team. Maybe someone on the inside was working against Kensi and made it look like an outside attack. Another twist could be that the bullet was laced with a slow - acting poison, adding more drama to her survival struggle. Or perhaps the shooter was aiming for someone else, and Kensi got in the way accidentally, leading to a search for the real target.
One possible plot twist could be that the shooter has a personal vendetta against Gibbs that dates back to a case that Gibbs thought was long closed. Maybe the shooter was wrongly accused in that case and has been planning revenge ever since.
In this type of fanfiction, it might be that Kensi is lured into a trap and gets shot. Her teammates would be devastated. The story could show how they hunt down the people responsible. As Kensi is in recovery, she could have some self - doubts about her abilities. But with the support of her team, she gradually overcomes these and gets back to her old self, stronger than ever.
A possible suspect could be an informant who has turned on Tony. Maybe the informant was promised a better deal by another party if they got rid of Tony. Also, it could be a new criminal on the scene who sees Tony as a threat. This new criminal might be trying to establish their power and reputation, and taking out a well - known NCIS agent like Tony would be a big statement. Another suspect could be a person with a grudge against the NCIS in general, and Tony just happens to be an easy target.
Well, in the 'NCIS Abby gets shot' fanfiction, she might get shot while trying to protect one of her colleagues. Abby is very loyal and would put herself in harm's way for her friends. It could also be that she is lured into a trap and then shot as part of a revenge plot against the NCIS team. The shot could be life - threatening, leading to a tense race against time to save her in the story.