When Sherlock throws a fit, he won't even let John near him - and not for lack of trying. It used to bother him... that was, until he realized that the only one capable of calming Sherlock in moments like these was his big brother, Mycroft. And really, it is just nice to see them getting along for a change. That, in and of itself, is worth taking a small step back in this aspect of Sherlock's life.