The net moves after an attack and the crowd expects a whistle. Before judging the incident, ask what touched it and during which action. A moving net does not by itself show every fact the referee needs.
The FIVB 2025–2028 rules, particularly Rules 11.3 and 11.4, distinguish contact during the action of playing the ball, contact outside the antennae and interference. Use the regulations applicable to the particular competition as well.
Watch the player through the action
Contact with the net between the antennae during the action of playing the ball is a fault under the cited rules. The action includes more than the instant of ball contact, so follow the player’s movement rather than freezing the replay at the hit alone.
Players close to the ball who are trying to play it can be involved even without touching the ball. Conversely, not every incidental contact anywhere around the net has the same status.
Check how the net moved
The ball itself can drive the net into an opponent. That situation should not automatically be treated as the opponent reaching into the net. Contact outside the antennae also requires attention to whether play was interfered with.
For a learning exercise, describe three observable details before stating a conclusion: the contact location, the player’s action and any effect on play. If the camera does not show a necessary detail, mark the judgment as uncertain.
Listen to the official decision and, where available, the explanation or challenge outcome. A single spectator angle may conceal the relevant movement.
Understanding the context makes volleyball easier to watch without reducing the rule to “the net moved, therefore a fault.” The useful habit is to follow the full action and apply the actual rule to the facts that can be established.