What the hec ?

I played a nice game yesterday. My opponent was playing comfortably and suddenly his world collapsed.

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bxf3 7.Qxf3
The Teichmann Exchange defense

7...c6 8.g4 Qxd4 9.Be3
Black grabs a second pawn, realising that white has a terrible initiative.

9...Qe5 10.000 e6 11.g5
The thematic advance is here correct as well.

11...Nd5
Wrong - but what human is able to predict the outcome of the resulting complications ?

12.Nxd5 cxd5
12...exd5 is visually worse, as the queen gets cornered, eg 13.Bf4 Qe6 14.Qg3 (++)

13.Bf4 Qe4 14.Qxe4 dxe4 15.Bxb8
Removing black's possibility to block the bishop's check. Now black's world collapses.

15...Rxb8 16.Bb5+ Ke7 17.Rd7+ Ke8 18.Rxb7+
18.Rhd1 would have been even stronger, but black wisely resigned here.

What a line ! Black's 11th move was bad and leads to a forced loss, but the defender did not realise it untill move 16.

11...Nfd7 would have been stronger, with white having only a small lead after 12.Be2