Red 11 jumps to attempt a 3-point field goal. After releasing the ball, the referee calls a foul in the act of shooting to White 3. Article 33.1 The cylinder principle is defined as the space within an imaginary cylinder occupied by a player on the floor. Article 33.2 As soon as the player leaves his vertical position (cylinder) and body contact occurs with an opponent who had already established his own vertical position (cylinder), the player who left his vertical position (cylinder) is responsible for the contact. Outcome: Correct decision from the referees. Defender White 3 invaded the shooter’s cylinder, creating a contact on his knee. The 3-point basket is valid and Red 11 is awarded 1 free throw.