Keamy dies activating the bomb, Jin gets left behind

Even though Locke tries to keep him from dying by trying to stop his neck from bleeding, Keamy dies anyway and his final words are "Wherever you go, Widmore, will find you." Ben's response is "Not if I find him first." When Keamy dies, the device on his arm is triggered which causes the light on the bomb to change from green to red.

On the freighter, as the light turns red, Michael continues to freeze the battery as the tank of liquid nitrogen runs out. He tells Desmond and Jin to leave, but Jin stays behind to help. Desmond arrives on the deck just in time to find the helicopter returning. He tries to warn them about the bomb, but the fuel is so low, Frank has no choice but to land. Back with the bomb, Jin studies the diagram of the explosives, but Michael tells him that he needs to go because he is a father now. Jin makes it to the deck just in time to see the helicopter taking off. Sun screams for Frank to turn around but he can't/doesn't. Yunjin Kim's acting in the scene is heartbreaking as her character is separated from her husband.