..............Okay, time to go out on a limb here; Let's look at Bridget she has killed or had killed her daughter, her husband, George, Henry, (and how many other people at the alligator pond) Billy for his head for Sanchez whom she killed also, then had Mr. B killed by Mr Gray, then Julie. Not to mention she tried to kill Trevor all this time to frame his father, but it went more then that. She had Mr. B try to kill all aboard the boat, including Julie and Joel. Bridget tried again with Mr. gray, who thought he imploded the Kookaburra with Trevor's family and friends aboard. Another nasty aspect of Bridget, now we have her taken an active role in killing Joel, Lisa Trever and Shane. She is a nasty piece of work and deserves as the fans demand a horrible death!
So, I have a couple of scenarios on this: Bridget alone with no back-up embarks on Trevor's boat, where she is caught by Trevor and company, tied up and captive. Meanwhile Joel and Shane go back to her boat and see that if they can take control of it.
Okay, until the last chapter Trevor has never killed anyone, Bridget has killed many and will not stop until Trevor and company are killed. With that in mind, Trevor has a choice. And it is either him and his friends or Bridget here, so I think that Trevor has Bridget captive, tied up and hurting, and she pleas with money and (false) remorse. So what does Trevor do?
Scene one she needs a death that will satisfy the readers:
Trevor decides to send her overboard with a weight attached to her as he experienced before.
Trevor decides just to send her overboard, bleeding and as a shark attractant.
Or he shots her to death, the later I don't believe will satisfy the readers.
Trevor and company take over the Sea Witch and tow the Atlantis behind her, keeping focused of the other boats of Bridget's position as they run from the area, they run north to Gitmo.