Sherlock’s face in the first gif… he’s just...

Sherlock’s face in the first gif… he’s just like, seriously, you’re going to humiliate me like this NOW, when I’m supposedly in a severe overdose? This is how you want to play it? He rolls his eyes. Then there’s Mary’s tight smile - she knows he’s in love with John and as much as she delights in causing him pain, it still gets under her skin. So Sherlock doesn’t shy away from it, but gives an explanation that’s both flippant (for Mary) and terribly poignant (for John). And then looks at John’s face. He didn’t miss that, though he may have missed the underlying Mary/Sherlock battle.