Ted waits patiently, looking between the two with mild interest. He actually finds it kind of exciting to see them at work, even if he has no idea about the context. But then he probably wouldn't enjoy the context very much anyway.

"Yes, absolutely," he answers Joan when they've finished their conversation. "Nice meeting you," he says to Sherlock, and he actually means it. Whatever impoliteness Sherlock exhibits, Joan seems perfectly capable of handling it - not a surprise. Ted looks forward to having an actual conversation with the man sometime.