Cut to Walt in the airport lot, getting the keys from the girder, getting the bag from the tire well. He opens the bag and we see there's some cash, a passport, and lying on top of it all, a holstered gun. Uh oh. Walt zips the bag closed (POV shot from inside the bag!).
Mike stands alone, tossing stones into a desert creek, maybe wondering how just a few days ago he thought he'd made that all-too-rare clean retirement, when he hears Walt pulls up to the clearing. They stand about ten feet apart from each other -- classic duel positions -- and Walt has the bag in his hand. But before he'll deliver it, he wants the names of the nine guys. I think at this point even Mike knows that the only thing to be done about the nine is to have them killed, but it's Walter, and Mike hates him, so he stonewalls. The only thing left to do is leave town, he says, which draws a scoff from Walt, who's all, "Some of us have family and people who depend on us." Kudos to Mike for not showing even a little bit how sharp that particular dagger felt going in. Surely he had to flash on little Kaylee's face when Walt said that. Anyway, Mike approaches Walt (who totally flinches) and calmly takes the bag. Of all the things Mike probably wants to say to Walt, he settles on simply, "Good-bye." But Walt is seething. "You're welcome!" he spits, and demands the names of the nine again. This sparks a snarling, spitting war of words between the two: Walt sneering about how Mike got caught, while Mike goes off on a rant about how they had a great set-up under Fring until Walt and his stupid pride and ego had to blow it all up because he couldn't stand being anyone's subordinate. "If you'd done your job and known your place, we'd all be fine right now," Mike yells, then stomps off to his car, leaving Walter White behind him forever.