I read it as "Imagine what a sherlock it" I tried to read again but kept reading it as sherlock instead of shock and so i was like fuck it im going to keep reading then i realised this is a sherlock post wow what a coincidence
That's a head canon thing I expect. But it makes a lot of sense of why Sherlock would be so darn protective of her! That is a terrible theory! But it is a great reason for them to be so protective! I would personally like to Slap Mycroft in the face now!