As cute as the post-credit sequence in the drug den was (and yes, it feels weird to write “cute” and “drug den”)—and this was lifted from Doyle, too; note that the best of the program adheres mostly to Doyle’s original work—I feel Sherlock would have known that by addressing John he was inviting having his cover blown. He knows John and so should be able to reasonably predict John’s reaction, which would certainly involve Sherlock’s name being shouted. So . . . Are we supposed to believe Sherlock had a momentary lapse in judgement in drawing John’s attention (maybe couldn’t help himself because he so misses having John’s attention, though the delivery of “Did you come to fetch me too?” doesn’t quite give that impression), or that he really wanted to have his cover blown, or that he wasn’t actually undercover at all?