Bava Batra 107: "So Animals Can't Jump Over the Fence": Dividing Property

A case of a debtor coming to collect a deceased father's debt from one of two brothers who had divided their father's estate: is the brother who covered the debt left high and dry or do they redistribute the entirety of the estate? Also, what do judges do when they are in the process of appraising and distributing property for orphans, and they disagree about the appraisal? Plus, what happens when a seller sells half a field without specifying which portion? Or specifying inexactly? Also, how a fence should be set up to divide that land.