Hi! Thank you for the question:
I suppose technically that’s a possibility, but as it’s a narrative-focused, cooperative game, that’s only an issue if the player group agrees it is. In light of that, a character can be knocked Unconscious/killed even if they haven’t exhausted their EP. If the GM or other players agree it’s something that would likely happen (after falling down, or getting struck on the head by an opponent, etc.) and the character fails to avoid it, then they’re unconscious/dead.
I hope that’s cleared it up?