So. It's before... whatever happened to make Anakin into Vader. Luke swallows. He doesn't want to be the one to tell Ben Kenobi about the fall of his apprentice. It doesn't seem like his place. And his inherent thirst for knowledge about his past trumps freaking out about the manner in which it's being learned.

After all, you can't really get more awkward reunion than Cloud City.

"Wait," he says. He's now turned totally towards Obi-Wan, entire focus on the other man. The rifts, the rain, the Chantry and the Inquisition all fall away, for the moment. "What do you mean 'of course'?"