When must a non-active referee call a violation related to the jumpers?

The non-active referee is responsible for monitoring the players' conduct during the jump ball and ensuring that the rules are properly enforced. A key aspect of this responsibility involves observing any violations that occur as the jumpers attempt to secure possession of the ball. If the ball is touched by the jumpers on the way up, it constitutes a violation because the jumpers must not touch the ball before it reaches its peak point—this is a fundamental rule related to the jump ball situation.

When the jumpers make contact with the ball before it is at its highest point, it is classified as a violation known as a "jump ball violation." The non-active referee is in an ideal position to spot this, as they are observing the play closely and can ensure that the rules regarding the proper procedure for the jump ball are upheld.

In contrast, while the other options might involve scenarios that could warrant attention, they do not directly pertain to the critical timing of the jump ball itself as outlined in the rules. Issues of contact with the referee, placement of feet, or attire, while they may lead to other considerations of player conduct, do not fall under the specific violation that occurs during the jump ball. Thus, the focus on jumpers touching the ball on the