I like this idea too.
It seems like a logical continuation of the "damage my fatigue to make me topple" mechanic; perhaps you don't even need a new bar?
Maybe it could just be like "negative stamina," where you take damage in excess of your stamina, and when you hit say -50% or something you're unconscious.
(This is essentially what Dungeons and Dragons v4.0 does with health; damage taken in excess of your Hp value is totaled as "negative hit points," take too many and you're dead dead)
It seems like a logical continuation of the "damage my fatigue to make me topple" mechanic; perhaps you don't even need a new bar?
Maybe it could just be like "negative stamina," where you take damage in excess of your stamina, and when you hit say -50% or something you're unconscious.
(This is essentially what Dungeons and Dragons v4.0 does with health; damage taken in excess of your Hp value is totaled as "negative hit points," take too many and you're dead dead)
That's how Fallout New Vegas worked (not sure about FO3, but maybe). Negative stamina put them unconscious.