This feel like some karmic retribution to the people of the village. I'm hoping MC can get away. I don't know why, but the girl gives me the impression of being an opportunist that could betray the MC if the incentive was there.
You're telling me that entire thing if it caught a stray flame would alert all the nearby undead? Well that village was always doomed to fail. Not to mention that eventually luck would allow someone they killed to stumble on the place again. All around bad idea.