Bava Metzia 38 - Shabbat April 6, 27 Adar 2

If one is watching an item and it begins to rot, should the shomer sell it or leave it and return it in whatever condition it is? There is a debate in the Mishna regarding this issue and amoraim disagree about the reason for the rabbis' opinion. Rabbi Yochanan claims that the tannaitic debate is not relevant if the item has rotted. Two difficulties are raised against Rabbi Yochanan and are resolved. Is there a connection between this issue and whether or not one is allowed to go into a relative's field who has been taken captive and work the field or not? Rav and Shmuel disagree about the relative using the property of the captive. Was there a tannaitic debate about this as well?