Back at the hatch, Jack and Locke carefully put the dynamite in place. Locke asks for the fuse, and Jack gets it, but when Locke holds out his hand for it, Jack just says, "I'll do it," and I guess Locke decides that whatever skills he learned at Sprawl-Mart and the box company, he'd be well-advised to leave this task to the guy with the surgeon's hands. The fuse set, they amble over to where Kate has unwound the fuse as far as it will go. Locke says it's plenty long, and they should take cover. He'll light the fuse, and there'll be plenty of burn time for him to take cover as well. They yell for Hurley, who yells back that he's coming or whatever. Or they could just tell him to stay where he is for a moment.
As Jack and Kate take cover, she goes off on him for taking the dynamite in his pack, which you know she's been waiting to do for hours. Come to think of it, I'd like to know just how it was that Jack pulled off that little bit of sleight of hand anyway. "I made a judgment call," he says, and she points out that they drew straws, and he points out, completely correctly, that this was too important to be decided by drawing straws. He might also want to point out that since she went running willy-nilly all over the place when she thought she had dynamite in her pack, he made exactly the right call. She tries to tell him that he had no right, and he snaps that everybody wants him to be the leader until he makes a decision that they don't like. Which is true, but, um, duh, Jack, because that kind of is how a democratic society WORKS, after all. If you don't like the decisions your leader makes, you try to make him NOT YOUR LEADER anymore. "You wanna keep second-guessing me, Kate? That's your call." Oh, get over yourself. He tells her that there's something she needs to know: "We survive this, we survive tonight? We're going to have a Locke problem." They both look at Locke, standing at the end of the fuse. "And I have to know that you got my back." Without hesitation, she says, "I got your back." So they like each other now, in case you're keeping score at home.