Verifying Attacking Manual 2

Attacking Manual 2-Aagaard(Quality Chess 2010)
The feature game is one of the examples from Ch2-Typical Piece Play. The game was played in a correspondance event and Aagaard now analyzed the attack deeply. 

I spent an evening attempting to solve (and failing) the chapter preview problem. The solution was not so clear and then after checking the game over I finally got it.

More on the Benefits of Correspondance Chess



Here is the feature game

Da Costa Junior,Luiz Roberto G - Jungmichel,Dirk
Scandinavian 3… Qa5 4.d4 Nf6 5.Nf3 c6 6.Bc4 Bf5 7.Bd2 e6 8.Qe2[B01]
Corr Brazil vs Germany corr CIF, 2002

This is the critical position where white has just played 25.Qc4+

25.Qc4+

Position 1(Black played 25...Re6)
How should white continue the attack?

White to Play

25...Re6

Position 2(Analysis 25...Nd5)
This is the proposed improvement over 25..Re6. Is it really an improvement and what should white play now?

White to Play

25...Nd5