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Surtr kept slashing away Demons while his companions advanced through their army. The Demonic Beasts were the weakest, and with Surtr's magic, they were weakened enough for them to gang on the ones he wounded and kill them effectively.
At the same time, Nadia and Mina were unleashing their strongest spells and techniques, advancing forwards with their massive new sizes, awakened after they drank several Elixirs made of Ancient Fire Titan Blood.
Jamar in the other case, was conjuring his mushrooms across the various enemies, capable now to spread it like a disease, these special mushrooms feed on the demon's demonic energy and exploded, dealing constant damage.
Alone they weren't much to care about, but as they spread like disease, the damage they caused became increasingly more impactful.
Jarma's physical techniques weren't the strongest out there, but he was able to compensate with his incredibly adaptable Mushroom Damage.