... 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 "Unknown374"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5r1r/2pk4/R3bp2/2Pp4/3q4/3B2pP/3NQ1P1/1R5K b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Bxh3 2. Bb5+ Kd8 ( { Black can try: } 2... Kc8 3. Ra8+ Kb7 4. Bc6+ Kxc6 5. Qb5# ) 3. Ra8+ ( { White can try: } 3. gxh3 Rxh3+ 4. Kg2 Rh2+ 5. Kf1 Rxe2 6. Kxe2 Qxc5 { Black wins with a large material advantage. } ) 3... Bc8+ 4. Qh5 Rxh5# 0-1