
Soooooo... somehow Sherlock throws a lookalike off the building, runs downstairs while changing into a bicyclist disguise, bikes around the block just in time to run into Watson, to inject him with some substance that gets him to hallucinate Sherlock's face on an entirely different body? I think that's stretching credibility for this show.
Well, based on his conversation with Molly, we know it's not Sherlock hitting the pavement and another corpse, so clearly there are shenanigans involved with Sherlock's face. Moffat has said there's a big piece of the answer in the episode that most people haven't picked up on, and the only thing I can think of is the cyclist hitting John, which has nothing to do with anything else.









