There will be spoilers below -
In the new Justice League: Doom film the Legion of Doom is creating a plan of how to eliminate/stop the JL. Ma'alefa'ak is trying to take out J'onn with some kind of flamable chemical that sets him on fire.. yadda, yadda, yadda... point is MM is set on fire and is running around all over the place in pain, eventually the fire is put out and J'onn returns to normal. Back to Ma'alefa'ak when he sees J'onn back to his former self he says something the lines of ''But he should be on fire for weeks'', this is where i get confused... Isnt fire supposed to Kill martians? Does it simply inhibit then? Not kill them?... that seems kinda stupid.