Back at the accelerated raft construction site, Walt tosses his dad a bottle of water, then sits down and asks Mercutio what he and Sawyer were arguing about. "Told him something he didn't want to hear," says Mercutio, sitting down next to him. "Why does he want to get on the raft so much?" asks Walt, and Mercutio tells him it's because Sawyer knows it's going to work. Walt wants to make sure that once they get rescued, they'll come back for the rest of the lostaways. Mercutio, who a moment ago had no problem promising his son that they were going to be rescued, then warns Walt that it might be hard to find the island again, though he assures him that they will look. "But there's no guarantees. That's why you and me --" but we never get to hear the end of that sentence, because Mercutio suddenly starts grunting and wincing and clutching his stomach, crumpling to the ground. Walt starts shouting, and Mercutio stops puking long enough to tell his son to go get Jack. Commercials.
Turns out Walt was also born to run, as he's tearing through the jungle, coming upon Sun (note: she's holding a water bottle just like Mercutio's) and Kate, who want to know what the problem is. Walt explains that it's his dad. "His stomach is really bad." Sun's eyes widen slightly. Kate tells her to take Walt back to Mercutio while she fetches Jack. Only after she goes running off that she doesn't seem to know where he actually is, and decides that coming to a halt and screeching "Jack!" while the camera spins around her is the best option available to her at the moment.
The hatch. Jack wants to know how long Locke has known about it, and Locke says about three weeks. "You been out here for three weeks, digging this thing up, and you never told me about it," says Jack. "All due respect, Jack, but since when do I report to you?" says Locke. Good question. Jack shoots back with, "All due respect, John, but you lied." Sayid, taking this all in, looks at Locke like, "Oooh, snap." Locke asks how long Jack had the case of guns before the rest of them needed to know. "You used your best discretion, I used mine," says Locke. Jack's got no answer to that one, so he finally just asks how they get it open. This sets Sayid a-spazzin', surprised that Jack wants to open it. "I brought you here to talk him out of this insanity! Anything could be inside," he says, and Jack shrugs and says best-case scenario, there are supplies. Worst case, it's a shelter. Sayid says he can think of worse cases than that, and points out that there's no handle anywhere visible. "Could the reason for that be more obvious?" I'm wondering if he's going for something specific until he says, "Maybe it was never meant to be opened from the outside."