If one or both parties to litigation are suspect with regard to oaths, they can't take oaths, so they divide the funds and carry on. But Rav Nachman said he didn't know the halakhah in this case - which was surprising, perhaps, but when push came to shove, he did determine this to be the practice too. Also, contradictory witnesses - 2 pairs - which are understand differently by Rav Huna and Rav Hisda.