I've just played f6, in a completely lost position. Here white played the obviously looking Bxd5?? stripping that pawn's only defender, but black has an important in between move that devastates white - Rxa1! with a won game for black, the game continued Rxa1 Rxa1+ Kg2 Bxd5+ Kh3 Bg2+ 0-1
Anyhow, that would be considered a Zwischenzug, right?