Good Wörishofen (part seven)

THERE was an instructive moment in the late-opening of my round six game.

White has just played 12.Ng1-e2 in Rudolf Urban (1841) - Spanton (1901)

I replied 12...Bg4?, thinking I was adding to the pressure along the e file.
But the move gives White a tempo to untangle, which he did by 13.f3 Bh5 14.Kf2, although RU was unable to convert his edge (½–½, 42 moves).
Instead, I should have chosen a line such as 12...Be6 13.f3 Nb6 14.Kf2 Bc4 (Stockfish9), getting rid of White's bishop-pair.