LIN:I can’t believe your sweet tempered father was reincarnated into that girl. She’s tough as nails. TENZIN:Reminds me of someone else I knew at that age. You two might get along if you’d only give her a chance.
Sherlock grows up a bit, becomes more of a man, stops being the genius child…he was completely blind, he was completely blindsided by who that present was for, he realizes she cares for him. He realizes she’s really hurting. And he realizes, possibly for the first time in his life, that he doesn’t like what he just did. He thinks ‘I’ve got to fix that.’ He’s been cruel before, but it’s always been sort of accidental, or it’s been minor. And he thinks ‘I’ve got to fix that. That’s not good enough. I can do better than that. And I do care that I’ve just hurt her.’ -Steven Moffat (x)