A short thought on what ran through Sherlock's mind at the end of "The Reichenbach Fall." Some spoilers. Remember that feedback is appreciated!
The blood had yet to curdle on the rooftop, and Sherlock's heart starts to race (dear God, dear God he's actually done it, there's no stopping now). He looks up, out past the ledge, past the blue sky (only one way to save them, only one way, but how to sell it?) and knows now what has to be done.
He walks over to the ledge, placing his feet firmly on top of the ledge (really is a narrow thing, this) and peering down into the street below. Sherlock sees the car stop, and a familiar figure climbs out (John, please forgive me, this is the only way). His fingers press a familiar button, and instantly the only voice he wants to hear (the only one that matters, the only one that can keep Lestrade and Mrs. Hudson safe) is on the end of the line.
Sherlock tells John it is all a lie, that Moriarty's tales are true (John will never believe it, never; yet he must believe it or it is all for naught). He keeps the one person he so desperately wants to see at length (can't have him figuring it out, clever John, my ordinary and clever John). He keeps John focused on him, and he knows (he knows) that John is watching.
He thinks about the fresh corpse. It's a bit small, but thankfully Molly knows how to dress such things properly.
(Thank God for Molly; she can hide everything. She does count.)
All that matters is that the right people see; that they see what is expected of the great Sherlock Holmes. He looks out past the ledge, listens to John's pleas, and allows a bit of the sentiment he so disdains to roll down his cheek. He thinks about Mrs. Hudson's words to his brother concerning family, and knows that she is right (dear Mrs. Hudson, she has her moments).
Sherlock steadies the corpse for its grand entrance, and watches as it falls (ironic, Moriarty ends up protecting the people that matter most, the ones he'd set out to destroy), and thinks about the lingering threats that still exist to those he counts most (a long and arduous journey ahead, alone to keep them safe).
He sees John's reaction to his 'death,' and his throat tightens (alone to keep them safe, just until the threat is extinguished). In one aspect, Moriarty has had his revenge (Sherlock's fall and isolation), but it will not last for long.