Since I haven't actually read this particular fanfiction, it's hard to say for certain. However, based on the title, we can assume that Richie is the main focus. The Deadlights are likely some sort of supernatural or dangerous element. It could involve Richie being trapped in a world created by the Deadlights, facing his worst nightmares perhaps, and the story might be about his journey to break free from this terrifying situation, whether through his own strength or with the help of others.
I don't know who the author is. There are so many fanfiction writers out there, and without more information, it's impossible to say.
Well, in such a fanfiction, Richie might experience intense psychological horror. The Deadlights are often associated with mind - numbing fear and chaos in the related lore. So, he could be subjected to terrifying visions, lose his grip on reality, and maybe even have his worst nightmares come to life right before his eyes.
It could be his friends. In many stories, friends are the ones who come to the rescue. They might have some special knowledge or power that can counter the effects of the Deadlights. Maybe they've been researching about it and find a way to break through the hold it has on Richie.
One possibility is that Dumbledore gets caught spying on a group of Death Eaters. This would put him in a very dangerous situation as the Death Eaters are extremely cruel and loyal to Voldemort. He might be tortured for information about the Order of the Phoenix. However, Dumbledore is very resourceful and would probably be able to hold his own against them for a while, giving his allies time to figure out a rescue plan.
In some cases, when Dexter gets caught, the people who catch him might try to rehabilitate him. They could think that there's still some good in him and attempt to change his ways. However, Dexter might resist this change as his nature is deeply ingrained. This could lead to a power struggle between him and those who want to reform him, creating a lot of drama and tension in the fanfiction story.
Well, it could be that Ash gets caught in the Pokeball by accident. Once inside, he might start to understand the feelings of Pokemon when they are captured more deeply. He could try to figure out a way to escape, and in the process, learn some secrets about how Pokeballs work that he never knew before.
In certain fanfictions, Dumbledore could get caught in a lie. Maybe he told the students one thing about a particular magical artifact, but then was caught when it was revealed he knew more than he let on. This would create a lot of drama as the students and other faculty members might lose trust in him for a while.
There's also a chance that Dumbledore gets caught by a group of rogue magical creatures. For instance, if he was exploring an area that was supposed to be off - limits to wizards and the creatures there saw him as an intruder. They might not be as rational as wizards and could hold him captive without really understanding who he is.
Even some of the Hogwarts professors or students could catch Dumbledore. Maybe a curious student stumbles upon Dumbledore in a restricted area where he's doing something strange. Or a professor who has a different view on how to run the school catches Dumbledore in the middle of an action that they think is wrong for the school's environment.
There was a mom who got caught trying to spy on her teen's text messages. She took the teen's phone while they were sleeping, but the teen had set up a camera in their room to catch any intruders (as a joke). So, when the teen checked the camera footage later, there was the mom looking through the phone.