What if Sherlock somehow used the fear gas from Baskerville to convince John that he saw him jump off Barts? After all, in HOB, Sherlock made John see the Hound after locking him in the lab. Maybe that was the purpose of Sherlock calling John to leave his “note” Plant in John’s head the idea that Sherlock was about to commit suicide so when John finally saw the body, he would see what his fear-induced mind needed to see: Sherlock dead. That’s why the cyclist needed to knock John over, to increase the disorientation his mind was experiencing.
As 2012 comes to a close, let us take a moment to remember all the Sherlock Season 3 that didn’t happen.