He worked something out with the CSI woman to fake his death. That's why he went to see her. She stitched his face onto some other body. You saw him jump but not hit the ground. That's why he told Watson to stay exactly where he was, so he'd see him jump but not land.
..or something like that.
Argh - I knew he wouldnt be dead....but a body fell
I guess that was Moriaty? - But then the body on the ground had the same hair as Sherlock
Was the kid on the bike who knocked Watson over - on purpose, in order to give Sherlock time to get down and with the aid of other accomplices, get in place of Moriaty - to fake his suicide?
I have to watch it twice as well.....as Ive got terrible eyesight, I never catch the text messages that flash up in nearly every episode - How I wish I had SKY+ or something to rewind bits!!!
The guy in the stairwell was an assassin - who would have killed Watson had Sherlock not jumped - they think Sherlock jumped, so no need to kill Watson
Anybody else spot in the cast list that one of the old men at the Diogenes Club was played by Douglas Wilmer, who played SH on the BBC in the 60s. He's 92
it was all a set up to make watson think he was dead-and the bike knocking watson over stalled it long enough for there to be a switch between moriaty and sherlock. i dunno i was setling someone with earache whilst trying to watch it, will be watchign it again!