Blocking
A player moves into a position that effects a block or crowds his/her opponent about to return the ball; or, in doubles, one partner creates a hinder by moving directly in front of an opponent as his/her partner is returning the ball.
Interpretation
This call is just the opposite of the “failure to move” avoidable hinder. When a player “creates” a hinder by his/her movement, it is also avoidable. Sometimes a player, in the effort to get into a better court position, will cause contact with an opponent who is about to hit the ball, or a player will move in so close to an opponent who is hitting the ball as to cause a possibility of body contact. In either case, an avoidable hinder should be called. It is also an avoidable hinder if one player, just as his/her partner is hitting the ball, moves directly in front of an opponent creating a hinder.