A rival law enforcement agency member could be a suspect. Maybe they see Deeks as a threat to their own investigations or operations and decide to take him out. It could be a power play within the world of law enforcement.
One possible plotline could be that after Deeks gets shot, his colleagues in the team rush to his aid and there is a tense moment at the hospital as they wait to see if he'll survive. They start to reflect on their relationships with him and how important he is to the team.
He might be in a critical condition. His partner Kensi could be blaming herself for not being there to protect him. The team would be on high alert to find the shooter and make sure there are no further threats to Deeks or the rest of the team.
One possible scenario could be that Deeks gets shot during a dangerous undercover operation. His team members, like Callen and Sam, rush to his side. Hetty might use her connections to get the best medical help. And Kensi would be by his side throughout his recovery, their relationship growing even stronger in the face of this life - threatening event.
Well, in this fanfiction, Deeks might face a physical attack from an unknown assailant. Maybe it's someone from his past, like an old enemy he made during one of his cases. He could get injured badly and have to rely on his friends and colleagues to help him out.
Perhaps a mysterious stranger who has some unknown vendetta against the Heartland family. This person could have been lurking around the ranch for a while, waiting for the perfect opportunity to strike. Or it could be someone within the community who has a hidden agenda and sees Amy as an obstacle to their plans.
They're popular because fans care about the character of Deeks. When he gets hurt, it creates a lot of drama and emotional tension. People like to see how the other characters react and support him.
One good 'Deeks gets hurt' fanfiction could be 'When Deeks Fell'. It details his struggle after getting injured during an undercover operation. The author does a great job of showing his pain and the team's reaction to his injury.
One possible plot development could be that his friends and family rally around him. They might search desperately for the person who shot him. For example, if it was a case of mistaken identity, they could start to dig into Sam's recent activities to find any leads. Maybe they discover that Sam was unknowingly involved in something dangerous, like being in the wrong place at the wrong time during a criminal deal. This could lead to a whole new sub - plot where they try to figure out who the real target was.