Cal is happy with any scenario that involves Obadiah not saying anything.

"Yeah," he says, "they're mostly on the East Coast, but there's a couple out here. I just wish there was one a little closer."

He can do harmless, meaningless small talk for as long as he has to. Especially since Tony seems not to notice exactly how poisonous the atmosphere is in here. Cal would like, for Sherlock's sake as well as Tony's, to keep it that way. If Tony doesn't see it, after all, that means he doesn't have a reason to see it.

Either that, or - no, Cal would rather cling to what little optimism he can find right now.