So they don't have time to bicker about who's carrying dynamite, but they have time for the drawing of straws? Locke and Kate draw the short straws, so they're carrying the dynamite. Jack's clearly not impressed.
Out on the boat, Mercutio is explaining to Walt that they have a transmitter that sends out an SOS in case anyone's listening, and radar so they can see if anyone's out there. Jin flicks it on, and he and Mercutio fiddle around with the equipment while Walt turns his attention to Sawyer, who's reading the messages in the bottle. Walt indignantly tells Sawyer that the messages are private, and Sawyer just smirks at him. "Yup," he says. He then explains that he never knew Tracy missed her husband and kids so much, considering she's been using Scott to keep her warm at night. "That's Steve. Scott's dead," Walt corrects him, and Sawyer is all "whatever" and maybe Arse was right about the little group not caring about the rest of the lostaways after all. Then, reading another note, Sawyer wonders who the hell "Hugo" is and how he has $160 million to leave to his mom. Walt asks Sawyer how he'd like it if Walt read his note, and Sawyer casually explains that he didn't leave a message in the bottle because the only letter he ever wrote was to the man he's going to kill (without adding, "Assuming I get it right this time!"). Walt nonchalantly asks Sawyer why he's going to kill him, and Sawyer says "because I have to" and Walt gives him another "why?" and Sawyer just says "because!" and glares at Walt, like, way to intimidate a little kid, Sawyer.
Sayid and Charlie are ripping through the jungle, having a conversation about why Sayid thinks Rousseau's headed to the black smoke -- but it seems to me that if they have the breath to talk to each other like this, they could be running harder. But anyway, Sayid essentially figures that Rousseau's looking for the others, because they took her baby all those years ago, "and now she believes she has something they want." Anyway, they've found the place where Sayid has stashed the guns, and he's opening the case. "She's making a trade?" deduces Charlie brilliantly, and calls Rousseau insane, and Sayid charitably points out that Rousseau lost her baby -- like Claire just did. He hands Charlie a gun, but before letting go of it gives him a lecture on how this isn't about revenge and that Charlie shouldn't make it personal. Charlie's all "yeah yeah, gimme the piece." So Sun and Claire come running up, and I hate to say it but Charlie and Sayid are going to have to haul a whole lot more ass than that if they're to catch Rousseau. Being caught by a hysterical woman who recently gave birth doesn't exactly bode well. Not to mention, NICE HIDING SPOT FOR THE GUNS, Sayid. Claire's absolutely losing her shit, which we can cut her some slack for, and she's insisting she come with them, and hitting Charlie as he gently does his best to tell her that it's not such a great idea. (Not to mention that if she keeps hitting him, he's likely to bust a cap in her ass.) So she breaks down in sobs, and she says, "Bring him back, Charlie. Bring Aaron back." And Charlie says, "Aaron?" like IF YOU THINK HARD ENOUGH YOU MIGHT FIGURE OUT WHO AARON IS, CHARLIE. GOD! "I will get him back. I promise," he says. We pan up to the strangely-unaffected-by-wind column of black smoke again. Commercials.