I’m willing to bet everything in my name this was the first time anybody has EVER called him a nimrod his face says so
so Sherlock and Joan are killing it in the police inquiry like the perfect partnership they are and then we cut to Capt Gregson’s face
he just barely hides his smile as he watches
"I fight without mercy. A habit you should learn should you hope to defend yourself against bigger, larger opponents. Which may occur, unless we limit ourselves to investigating crimes concerning small children, or large house cats."
Sherlock’s fantasy: calling out Joan on a dumb question and being lavishly exalted by Capt Gregson
[he was obviously being facetious but you can’t deny he gets off on feeling superior to everyone else. such an egomanic]