If Joan's expression became a little sad, Ted's expression becomes a lot sad. It really is heartbreaking, because Sherlock is a lovely man, but Ted can absolutely understand why he's pushed people away. It's a very human thing, to try to prevent pain, but unfortunately causing more in the process.

"Well, then I'm glad he has us," he says softly. And it does seem like Sherlock is a bit more open to making friends now. It's never too late to start opening up to people, after all.