Jack tries to save Boone by giving him Jack's blood. Sun helps Jack, but the transfusion isn't working. Jack gets Michael to help rig up a contraption to amputate Boone's leg, but before he can, Boone asks that Jack just let him die.
Boone tells Jack of the plane and the hatch. Meanwhile, Shannon and Sayid have a romantic night together.
When Shannon returns, Jack tells her that Boone has died. Then Jack goes after John Locke to find out what really happened to Boone.
In flashbacks, Jack is getting married. At the rehearsal dinner, his fiancée, Sarah, says how no one said she would walk after her accident, but Jack fixed her. Jack has trouble writing his vows and his father suggests that maybe Jack shouldn't get married. The next day, Jack marries Sarah, saying that she got wrong, that really she fixed him.