"Jack" tells them he must return to the island core, as he promised Jacob, to restore the light at the waterfall cave. He instructs "Kate" to leave with "Sawyer" to get "Claire" into the airplane on the other island. "Kate" in turmoil kisses "Jack" goodbye, fearing it will be the last time. "Kate" and "Sawyer" jump into the sea and swim to the sailboat at anchor.