At a certain stage in many RPGs, I get to the point where instead of trying to picture the flow of a combat, I go, "Eh, I have no idea whether this is balanced, but the PCs have a bunch of tools, so they will probably figure something out". As long as they haven't burned through all their resources already, they should be able to turn it up to 11 for one fight.
I have seen again and again what a difference a party output of 30 Rune Points makes.