I do believe that your question came from a place of good faith. I am also not trying to play any gotcha game or prove anything here. I'm curious how you think it would be best to respond to your own situation.
My own inclination most times is to discuss the matter with the group based upon my understandings of the rules, principles, and fiction of the game. There are game principles in most PbtA games, which
@EzekielRaiden discussed earlier, which make this outcome somewhat unlikely, especially assuming good faith play by the GM. I think my gut reaction to discuss the matter would be true regardless of whether we were playing D&D, Dungeon World, Forbidden Lands, Call of Cthulhu, Fate, etc. It may slow down the game, but if all of our characters are dead and buried under a pile of rocks anyway in the fiction, then it's not like we have anything better to do with our time.