Charlie: So, you're telling me you saw a flash of Claire drowning this morning, so you knew how to save her?
Desmond: I wasn't saving Claire, Charlie... I was saving you. This morning, you dove in after Claire. You tried to save her but you drowned.
Charlie: What do you mean? I didn't drown.
Desmond: When I saw the lightning hit the roof, you were electrocuted. And when Claire was in the water, you drowned trying to save her. I dove in myself so you never went in. I tried, brother. I've tried twice to save you, but the universe has a way of course-correcting, and I can't stop it forever. I'm sorry - I'm sorry because, no matter what I try to do... you're gonna die, Charlie.
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From: Lost