Their fellow police officers could save them. The police force might launch a massive search operation. They would use all their resources, like tracking devices if they had any on them before the kidnapping, and follow up on any leads they have about Sanfino's possible hideouts.
It could be that Jamie and Eddie themselves manage to escape. They are both smart and resourceful. They could use their training and wits to find a weakness in Sanfino's kidnapping plan. For example, they might be able to trick Sanfino into making a mistake or find a way to communicate with the outside world and get help while still in captivity.
Well, it could be that Sanfino has some sort of vendetta against Jamie and Eddie. Maybe he's a criminal they put away in the past and now he's out for revenge. He might kidnap them to use as bargaining chips against the police force or to make them suffer personally.
Well, if Uncle Phil Sanfino kidnaps Jamie in this fanfiction, it could be a really dark and twisted story. Maybe Uncle Phil has some hidden motives. He might be after something that Jamie has, like a family heirloom or some secret information. Or perhaps there's some long - held grudge that we don't know about yet.
There's a chance that Jamie himself could rescue himself. He might be really smart and find a way to outwit Phil Sanfino. Maybe he discovers a weakness in Phil's security or manages to turn Phil's minions against him. This would make Jamie a very strong and independent character in the fanfiction.
In this fanfiction, it might be that Phil Sanfino is under the control of some other force. He kidnaps Jamie as part of a larger plan. Maybe there's a mysterious organization pulling the strings, and they need Jamie for some experiment or ransom. The story could then revolve around Jamie trying to escape and figure out what's really going on while also dealing with Phil, who may or may not be a willing participant in the kidnapping.
Jamie could escape by outsmarting Uncle Phil. For instance, if Uncle Phil has tied him up in a room, Jamie could find a way to untie himself and then create a diversion. He could make it seem like there is a fire or some other emergency, which would cause Uncle Phil to come running and give Jamie the chance to run away.
Obviously, Ben could be the one to save Gwen. With his Omnitrix, he has all kinds of powers at his disposal to take on Kevin and rescue Gwen. He knows both of them well, so he would be highly motivated to stop Kevin and bring Gwen back safely.
The Salvatores, Damon and Stefan, are likely candidates. They have always been protective of Elena and would do anything to save her. They could use their vampire skills and knowledge of Kol's weaknesses to stage a rescue.
Sky might also be a savior. He has a strong connection with Bloom and would be enraged to find out she's been kidnapped. He could use his combat skills and swordsmanship to fight Brick and rescue Bloom. Another possibility is that Tecna, with her technological skills, could track down Bloom's location and help in the rescue operation.
Nightwing could also be a likely savior. He was once Robin himself and has a strong bond with the current Robin. He might take it upon himself to rescue Robin, using his own unique fighting style and experience to outwit the Joker. Plus, he has his own network of contacts in Gotham that could help in the search.
Anna could be the one to save Elsa. After all, she has proven herself brave and determined in the original story. She would stop at nothing to rescue her sister from Hans's clutches.