Sitting a short distance away are Jin and Charlie, who springs to his feet at the sound of Claire in pain, but he's stopped quickly (and amusingly) by Jin, who just gives him a slight shake of the head. Charlie sits back down.
Back at the caves, Mercutio and Jack are preparing for the amputative exercise in futility while Sun looks after Boone, who's now coughing up blood. She shows the sodden handkerchief to Jack. He looks tired, rough, and the loss of blood couldn't have helped. He blinks a few times, then says, "Let's go," and proceeds, getting Sun to help life Boone onto a makeshift gurney. She's yelling at him that Boone's bleeding inside. "You can't save him, Jack!" she yells, kind of like Adrian yelling, "You can't win, Rocky!" and Jack roars at her, "Don't tell me what I can't do!" exactly like Locke would say. He maneuvers Boone into position and gets the leg ready for some separation anxiety. Mercutio's looking vaguely horrified as well, and Jack tells him he doesn't need to watch. Mercutio just says that Jack needs his help. Jack looks over for a long stare-down with Sun, who's standing there all, "J'accuse!" She breaks first and turns away. Jack looks conflicted. And we're going with doubtful, and now determined, and now doubtful again, and now agonized (or constipated), and as Jack grabs hold of the Cargo Door O' Death, he grimaces, and we flash back to his Fiancéetron 3000 reciting the vows she programmed herself.
And man, GOOD THING she insisted they write their own vows, much to Jack's distress, because otherwise how would they have ever had anything as original as her "in sickness and in health" stuff that she's reciting now at their wedding, being held outside in the cheap showiness of nature. "I risk it all, because I love you," she says, like maybe she's a compulsive gambler or something, and the minister thanks her, then tells Jack it's his turn, and Jack hesitates for about five hours, prompting a "Jack?" from the minister, and then Jack says, "I didn't write any vows," and all I can say is stand back from the Chernobyl-scale meltdown about to occur from the bride, because having recently gotten married myself, I know that when your wife-to-be asks you to do something, you do it and damn quick or risk grave bodily injury to yourself, and I can't even imagine getting up there and saying, "I didn't write any vows," if only because I couldn't imagine inviting family and friends to our wedding only to have them witness my slow and painful death on a church altar instead. And Sarah has this look of horror on her face, because she thinks what all the viewers are thinking, i.e. that Jack is about to ditch her, as he blathers on about all the trouble he had writing his vows, and wondering why that was, and figuring it's because he has trouble letting go. Then he says that maybe it's because he was scared of what would happen if he failed. "But I know one thing: I would never have been able to write anything as beautiful as what you just said," like NICE COPOUT, no-vow boy, and then he tells her that when she was talking about her accident last night, she got it all wrong: "I didn't fix you. You fixed me," and then I think he tells her he loves her and he always will, or something, but I missed it because I was throwing up all over the place. They hug and smooch, and the audience applauds.