Blue 2 is progressing when he receives the ball and starts a dribble. The referee calls a travelling violation. Article 25.2.1 A player who catches the ball while he is progressing shall release the ball to start his dribble before his second step. The first step occurs when one foot or both feet touch the floor after gaining control of the ball. The second step occurs after the first step when the other foot touches the floor or both feet touch the floor simultaneously. Outcome: Correct decision from the referees. When Blue 2 caught the ball, he had his right foot on the floor (the so-called gather step or step 0). His first step occurred when, after having caught the ball, his left foot touched the floor. His second step occurred when his right foot touched the floor. He released the ball after his second step, not before. This is a travelling violation.