Touch-move when move is illegal but opponent's piece can be captured by another piece This is the scenario: I pick up my Knight to capture my opponent's Bishop (touching the Bishop). I then realise my Knight was pinned to my King in the first place, so moving it would be illegal. However, I have already touched my opponent's Bishop with my Knight. Since I have touched my opponent's Bishop, would I have to capture the Bishop with another piece of mine (in this case my Queen can legally capture the Bishop instead), or am I allowed to just move any other piece entirely? Reference in FIDE Rules is Article 4.3.3 but it still seems it doesn't explain this scenario well enough.
Article 4.3.2 clarifies this -


  4.3 Except as provided in Article 4.2 [j'adoube], if the player having the move touches on the chessboard,with the intention of moving or capturing:
  
  4.3.2 one or more of his opponent’s pieces, he must capture the first piece touched that can be captured


In the scenario you describe you touch your knight and your opponent's bishop with the intention of capturing the bishop with your knight. Moving the knight is illegal hence you may not capture the bishop with the knight. However capturing the bishop with some other piece, your queen, is legal. Therefore you must capture the bishop with that piece.