Stop me if you think that you've heard this one before
Locke explains to Jack that the lone Ethan has the advantage against the forty-some lostaways for some reason, so Jack busts out the guns he's been hanging onto. "Why, Doctor, you've been holding out on us," says Locke, like anyone's going to entrust a gun to the guy who chucks knives all over the place.
So the lostaways' brilliant plan is to use Claire as bait, despite Charlie's protests. It works well, too, drawing Ethan out of the jungle, right into their trap. Even better, Ethan gets to beat up Jack for a little while, before the rest of the geniuses use their guns to put a stop to that. Then Charlie puts an end -- a terminal end -- to Ethan by blowing away a defenceless Ethan kneeling on the ground.
"What if you have no one to rely on but yourself?"
Later on, Jack asks Charlie why he killed Ethan, who could have told us where he came from, and about the others. Charlie scoffs at the idea that Ethan would have told them anything, and says he wasn't going to let that "animal" anywhere near Claire again.
"And your unspoken fears are finally expressed."
During a gathering on the beach that, to the best of my recollection, occurred before the death of Ethan, Locke berates the others for the infighting, saying they should all be worrying about the others. "We're not the only ones on the island, and we all know it!" he yells.
"You're lost, you're scared, you're in danger."
Locke and Boone, stumbling through the darkened jungle, with Boone wondering how Locke can still be following the trail.
"You would do anything to get home."
Locke says that if Boone wants to get back on his own, good luck, and he tosses him the flashlight, which Boone doesn't catch. Picking it up off the ground, Boone finds something in the earth.
"But what if you found a reason to stay?"
Boone wonders what the metallic object is, and Locke says that's what they're going to find out.
On the beach, Jack talks to Locke about him being attached to Boone at the hip, and we check in at various points of the hatch's excavation, as they try to figure out how to get in. We watch the useless trebuchet, and Locke bitching about how it was supposed to work, and Boone finally getting pissed off that if they're somehow supposed to get in, then why haven't they done so yet? Locke babbles about the island sending a sign and their faith being tested: "The island will show us how!"