Why must handball players have a fair opportunity to see and play the ball?

In the wall game of handball, players must be given a fair opportunity to see and play the ball to ensure the integrity and fairness of the competition.1

When a player's ability to see, reach, or return the ball is compromised by interference, it is classified as a hinder. Because the sport relies on rapid rallies and precise placement, any obstruction—such as an opponent failing to move out of the way, intentionally blocking a path, or interfering with a stroke—disrupts the fundamental mechanics of the game.12

To maintain fair play, these situations are addressed through specific rules:
* Dead-ball hinder: If interference occurs, play is stopped and the rally is replayed.1
* Avoidable hinder: If a player intentionally interferes or fails to move sufficiently, it results in an out or a point awarded against the offending side.1