Sec. 7. (a) If the defendant master, owner, or consignee, before final judgment, gives a written undertaking payable to the plaintiff, with surety to be approved by the clerk or sheriff, to the effect that the defendant will perform the judgment of the court, the attachment shall be discharged and restitution made of the boat, vessel, or other watercraft.
(b) A person who executes a written undertaking under subsection (a) shall, by order of the court, be made a defendant in the action instead of the boat, vessel, or other watercraft, and the action shall proceed to final judgment as in ordinary actions in personam. If a recovery is had by any of the plaintiffs, judgment shall be rendered against all defendants for the sum recovered.