release subsequent nodes after the outbid vnode j;
if the subsequent tasks are not released, then the current best scores
computed for those tasks would be overly conservative, possibly leading to a degradation in performance
// rebroadcast* --> empty bid with current time
The receiver resets its information state: a_ij = null and b_ij = 0, and
rebroadcasts the original received message so that the confusion can be resolved by other agents.