Obi-Wan smiled, "It's alright, I know it's...difficult. Here, more than usual, and with—"

He gestured at Luke and Mara to signify the entire issue with alternate or future timelines and family memebers that technically didn't yet exist. It didn't bear an easy explanation, "We should talk, but not now, and certainly not here."

Obi-Wan wasn't blind, of course. He'd seen— and felt — Mara's tensing at Anakin's arrival. Perhaps in the future they found themselves at opposite ends of a fight. She had said she wasn't a Jedi, after all.