Just after Sherlock falls to the ground, Watson is hit by a passing bike and knocked to the ground for half a minute, while people surround Sherlock's presumed body, blocking his view. So you just
know that Sherlock had everything set up prior to his final meeting with Moriarty - you just don't know exactly how it played out.
Yeah, I've seen that one
Now, Cumberbatcth and Freeman need to wrap up with this
Hobbit nonsense and get moving on season 3, dammit!