It seems peculiar that the rules allow for both players to cast stones at the same time. (Page 8, bottom.) What stops one player from waiting to see what their opponent does?
Hi Robert. As mentioned by Nick, the casting of the stones is determined by the assignment of cards. Players roll dice at the same time, assign their cards to the dice at the same time, then, when both players are ready, they reveal their cards. Since the cards and dice determine what happens, the placement of stones is already determined by the assignment of cards.