Missed Chance (2)

In the diagram below from Topalov - Aronian (Linares 2010) White had a chance to win immediately.

With 34.Rxe4! it becomes clear that after 34.- Qxe4 35.Qc3+ Kg8 (35.- Kxg6 36.Bc2) 36.Qc7! is murderous because of the threats Qxd8 and Qf7+ (-> Qh7#). 36.- Rd7 37.Bxd7 Nxd7 38.Qxd7 +-
GM Anish Giri wrote about this position on chessbase.com: "I don't know what happened on move 34. Perhaps Topalov is not in shape in this event."
Well I do not want to critisize Giri, but I don't think this combo is that easy to see because it's very unusual. I'm more with Dennis Monokroussos who says: "It's very easy to calculate, but not so easy to see in the first place."
Topalov played 34.Bb3 and the game ended draw in move 45.
45.