In the example game, Black decides to grab the f2 pawn with the knight, which loses on the spot. Capturing with check is better, but even then Black has to tread carefully. 5. ... Bxf2+ 6. Ke2 d5 7.Qxg7 seems to be best play, but at a fast time limit, Black could easily go wrong.
Morphy,Paul - Bottin,A [C20]
Paris it Paris, 1858