No but seriously though...<------It needs to be shot as Sherlock is looking John in the eye, but the camera is directly in Sherlock's face so he's looking directing in the camera as he says it. I think the Fandom would just die right there.
Normally most people would point out that it was a mistake, but not this fandom. This fandom makes something out of it to make the writers look even more amazing than they already are. Whether or not this is true we will all choose to believe it :,)