In the US TV series Stranger Things S01E08 The Upside Down, Jonathan, Nancy, and Steve had managed to set the monster on fire:
Not many seconds later, Jonathan uses a fire extinguisher to douse the fire:
It is clear that the monster was not dead yet when Jonathan used the fire extinguisher. (Indeed even a human would probably merely be severely injured rather than dead after being on fire for such a short duration.)
So why did Jonathan do this so soon?