Desmond ignores Ms. Hawking's warning and buys the ring anyway. He meets Penny along the Thames River where they get their familiar souvenir picture taken together. But Desmond realizes he can't go through with it. He ends it, telling Penny that he can barely take care of himself, how could he take care of her? Moving in and painting the rooms was too soon and finally he admits the real reason: she deserves someone better. They're not supposed to be together. Penny is heartbroken, calls him a coward and leaves.
In his despair, Desmond joins the British Army and drinks his last night away in a pub. Then the events he previously predicted to Donovan start to happen. Desmond was right, he does know the future, he simply had the wrong day. But when he warns the bartender he's about to be attacked, it's Desmond who gets hit in the head and WHAM!
Desmond comes to in the jungle, lying on the ground, naked. He's back on the island after he turned the fail safe key. All that remains of the hatch is the photo of him and Penny taken by the Thames. He starts crying and pleads for one more time, promising to do it right the next time.
"You're gonna die, Charlie!"
We WHOOOSH back, and Hurley is pulling Desmond off Charlie. Desmond admits ever since he turned the fail safe key he sees flashes of his life. He's tried but he can't save Charlie. Confused, Charlie asks what Desmond is talking about. Desmond explains when the lightning struck, it electrocuted Charlie. Then Charlie drowned while trying to save Claire. Charlie is on his own path, and the universe has a way of course correcting. Desmond can't stop it, because no matter what he does Charlie is going to die.
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