What is the effect on the other claimant's right if one claimant acts in certain capacities related to the sale or explicitly disclaims their right before the sale occurs?

Primary text

If one of the preemption claimants acts as an agent for either the seller or the buyer, guarantees the accountability (*'uhda*) for the sold item, or explicitly waives their preemption right before the sale, stating they have no preemption, the right is fully vested in the other claimant.