This rule changes how difficult it is for characters to be killed. This allows characters to stay alive (though unconscious) longer while bleeding out.
Characters die if they reach a a negative number below 0 HP equal to 2 + Level + Endurance (minimum of -4).
With this rule, incredibly tough high level characters will only die at a negative equal to -32 (10 END + Level 20 + 2) which allows for plenty of time until characters heal the bleeding ally. It also ensures really powerful attacks don’t guarantee the character will die.
While unconscious and being attacked, characters have their Soak halved (to a minimum of 1). This prevents characters who may be bleeding out from being immovable rocks unable to be harmed while they sit bleeding out on the floor with their vitals exposed.