[bucky]

I can see where the college rule book has info regarding jumpers and their restrictions. Article 4 has their feet on their side in their half circle. That is a restriction that does not end until the jump ball ends, as in article 2.

Section 2. Jump Ball
Art. 1. A jump ball is a method of putting the ball into play at the beginning
of the game or any extra period(s) by tossing it up between two opponents in
the center circle.

Art. 2. A jump ball shall begin when the ball leaves the official’s hand. The jump ball and all jump-ball restrictions shall end when the ball touches a non-jumper, the playing court, basket, backboard, an official or when the ball becomes dead.

Art. 3. Jumpers are the two opposing players vying for the tip during a jump
ball.

Art. 4. For any jump ball, each jumper shall have both feet inside the half of
the center circle that is farther from his team’s basket.

Art. 5. Each jumper may face in either direction.

Art. 6. The referee or designee shall toss the ball upward between the jumpers in a plane at right angles to the sidelines, to a height greater than either of the jumpers can jump and so that the ball will drop between them. The jump ball may be repeated when these provisions are not met.

Art. 7. When the ball touches the playing court without being touched by at
least one of the jumpers, the official shall toss the ball again.

Art. 8. Teammates shall not occupy adjacent positions around the center circle when an opponent indicates a desire for one of these positions before the referee is ready to toss the ball.

Art. 9. Players may move around the center circle without breaking the
geometrical cylinder that has the center circle as its base after the ball has left the referees hand(s) during the toss. A player positioned more than 3 feet outside the center circle shall not be subject to these restrictions.