... if your King is under attack you don't worry about losing a Pawn on the Queen's side.
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[Event "rated untimed match"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Unknown"] [Black "Unknown616"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "1k1r1b1r/ppp2ppp/4p3/1PP1P3/Q2B1q2/P4B2/6PP/3R1RK1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Bxc5 2. Bd5 Qg4 3. h3 Qh4 4. Qc4 Rxd5 5. Qxd5 exd5 6. Bxc5 { Black wins with a large material advantage. } 0-1