Prevent A Move That Is Not Threatened

I stumbled over the following game while wandering through The Database.

Those who hope to play the Abrahams Jerome Gambit - see "The Abrahams Jerome Gambit (Part 1)" - but then switch their aspirations to the Jerome Gambit, proper, might want to keep the play of this game in mind, should their opponent strive to prevent an early Knight's move that is not threatened.

Herrings  - Janssen

HMC, 1983

1.e4 e5 2.Nf3 Bc5 

The Busch-Gass Gambit.

3.Bc4 

Now, the Bishop's Opening.

3...h6 

I suppose that Black's 3rd move might just as well have been played if the game had started 1.e4 e5 2.Bc4 Bc5 3.Nf3 (thinking about 3...Nc6 and then 4.Bxf7+, the Jerome Gambit?) when 3...h6 could be an attempt to keep White's Knight off of g5. 

4.Bxf7+

I was surprised to find only 56 games in The Database with this position, although I was pleased to see White score 84%, as he is already better.

4...Kxf7 5.Nxe5+ Ke6 6.d4 d6 

White already has a forced checkmate.

Black holds on with 6...Nf6 7.Nc3 d6 8.Nb6 Bb6 9.Nxh8 Qxh8 (no games in The Database) when he has two pieces for a Rook and two pawns, but his King is far less safe than White's.

7.Qg4+ Kf6 8.Qg6+ Ke7 9.Qf7 checkmate