Sherlock appreciates how much Ted respects Watson, letting her make her own choices even if he might not particularly agree with them. Sherlock has run afoul with Joan's fierce independence in the past, and has learned, becoming better with Watson and even a better person in general. But Ted is already such a good person. Admirable, really.

He offers his hands to Watson, and she takes them and stands. It takes a moment for her to steady herself, but after she's sure on her feet the walk to the living room is pretty uneventful. She sits on the couch with a sigh and leans back into the cushions, enjoying the comfort.