Piecing It Together

There is a question that is frequently heard in yeshivos: “Why are we learning this topic in Gemara? Why is it relevant?” All topics of Torah are connected. The deeper understanding one has of one topic of Talmud, the better he will be able to understand an unrelated topic. However, for a Gemara learned this week there is a different answer.
This week, the daf learned a dispute between Rebbe Meir and the chachamim (Shevuos 42b–43a). The dispute relates to practical halachah, but not one that many people will readily come across. There was someone entrusted with watching a field that had ten vines filled with grapes—or so the owner claims. The watchman counters that there were only five vines filled with grapes. The subject of the dispute between Rebbe Meir and the chachamim is whether or not beis din can force the watchman to swear that he was only given five vines filled with fruit. Regarding the vines themselves, all agree that the watchman cannot be forced to swear because oaths are not administered on real estate. The vines growing on the ground have the same status as the land itself. The question is regarding the ready-to-harvest fruit. Are they considered like real estate or are they considered independent fruit?