I checked the CS and it looks like it's ABFA here too. Also corrected a spelling.
If a target's fatigue drops below zero, it will pass out and become unconscious until its fatigue regenerates to a positive value. This can be demonstrated on the player by lowering your fatigue to zero by jumping, then eating a lot of rat meat to damage your fatigue or removing a fortify fatigue enchanted item from the player. This will drop your fatigue to a negative number and cause you to pass out.
Using damage fatigue can be a particularly useful method for disabling an opponent, rendering them
unconsious and defenseless for many seconds. However, it may be difficult to lower a target's fatigue to a negative value, and the player may have to resort to using a combination of powerful poisons and stacked spells to do the job.