Surely Black must be consistent and take the bishop on e2. Of course, it does not look logical, but we need to consider the bishop's potential, not just its current position. (After all, why, in the Classical lines does White, in the face of a raging Black attack with ...f4, ...g4 etc, often capture the bishop on c8 (with his knight), rather than a rook on a8?- Also, in the Bayonet mainline, White responds to 9...Nh5 with 10.Re1 and 11.Bf1, to preserve his bishop.) 

In the quoted game, Bareev-Amonatov, after 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Nf3 e5 7.0-0 Nc6 8.d5 Ne7 9.b4 Nh5 10.a4 Nf4 Bareev continues 11.c5 f5 12.Bc4! (preserving the bishop from exchange), two moves later then kicks the knight from f4 by playing g3. 

Which piece is better now, the knight on h5 or the bishop on c4?

I've been trying this for years with great success for white. If black plays Nxe2 (which he rarely ever does... why exchange his best piece for my worst) I'm instantly better. the immediate f5 is the most common answer.