Back in the Pratcave, Charlie's still jittery and sweaty. Not any more than how we've seen him before, but perhaps now that Charlie's all covered in dirt and in a dark cave, Jack can finally pick up on the signs. "How long has it been, Charlie?" says Jack, who apparently studied Lenny Briscoe's technique for delicately broaching the subject of substance abuse with obvious addicts. Charlie at first pretends not to know what he's talking about, but then realizes there's not much point. "Almost a day and a half," he says. Jack asks how the withdrawal's going, if he's having any hallucinations. Charlie jokes that other than the conversation he had with Jack in the jungle about an hour ago, not really. "I could have helped you through this," says Jack, but Charlie says Jack thinks he's useless and a junkie to boot. "Useless? You're not useless," says Jack, who points out that it took a lot of guts for Charlie to come through that tunnel to get Jack. "I won't forget that," says Jack. I love that Jack's example of why Charlie is useful is that he tried to rescue Jack.
And just as Charlie starts to delve into how the cave reminds me of a confessional, he hears the soft beating of tiny wings. There's a moth, right behind Jack. Jack doesn't appear to hear or see it, although he never specifically says so. Charlie follows the moth up into a recess in the ceiling, and he begins to dig.
Outside, Kate's clearing out the collapsed-once-already tunnel, even as Mercutio tries to get her to take a break (this after we've seen a couple of shots to indicate how exhausted everyone else is, just so we're clear about how intent Kate is here). Kate just glares at him and keeps going. Shut up, Mercutio! She's a good digger!