(Sorry, I didn't notice that Zilrax also rolled phenomenally. You also spot a nun and can make an action with Heroism if you want before the battle starts.)
Also I forgot that I have holy water. If we splash that shit on the downed zombies, do they stop getting up.
Faeyna could try to exorcise them again maybe? Course there's an awkward fourth option. Get pregnant and she can shove their souls into there!