Locke and Ben are the Ares and Hephaestus of the Lost Olympus, and like true frenemies, the larger-than-life pair likes to stick close together, feeling each other out, watching each other, in "Dead is Dead." They're always on alert, and they have to be; when Locke let his guard down last, Ben clawed his way to control with a rope, a vacant hotel room and an airborne coffin.
But now, much to Ben's chagrin, Locke is back, and the power-balance has shifted. Ben has historically been the stony-faced, manipulative Brutus—the one with all the secrets—to Locke's betrayed Caesar. But in episode 5.12, as Ben slowly raises his head from his pillow, face aghast at seeing Locke alive, he's noticeably shaken. The men's dialogue, (Ben: "My God! You're Alive." Locke: "Yes, yes I am." Ben: "I knew it, I knew this would happen." Locke: "Then why are you so surprised?") shows Locke has gained the upper hand; Ben is, for once, floored. And as the episode continues, Locke's self-assured, suspecting squint compared to Ben's wide-eyed terror becomes more noticeable. Finally, when Ben tells Sun, "Dead is Dead, there's no coming back from it, even here," and reveals, "I'm terrified," we know the ex-confidence man has been undermined, an awesome role reversal between the two actors.

Loved this episode. I wasn't a fan of the first two episodes this season, but this show has been on a tear since.