After Claire and Charlie are kidnapped by Ethan, two parties of Jack and Kate, and Locke and Boone go looking for them. Jack encounters Ethan, who warns that one of the hostages will be killed if Jack continues pursuit. Jack and Kate find Charlie, blindfolded and hanging by his neck from a tree branch. Jack furiously performs CPR and Charlie comes back to life. Meanwhile, Boone and Locke discover a piece of metal embedded in the forest's ground. In flashbacks, Jack confesses to his superiors that his father had been under the influence of alcohol while operating.
(From Wikipedia)