It's the kinda team they are. Which is demonstrated in "Dungeon" (S01E018) and Finn actually counts on in "Morituri Te Salutamus" (S03E02). There is, in fact, another 'vs' episode... "Jake Suit" (S05E27), in which Finn shows just how tough he is.
reminds me of the worms from king kon.. remember that? when the group was in the pits thing and the GIANT crickets were hopping on them trying to munch on them, and the worms doing well.. THAT in the pick to xosom of the survivors and one of the survivors had multiple worms on him.. that skrewed up my childhood.. scarred me forever(idk if they were worms or leeches but they were ugleh and big)