Narrator:
Fp below zero is knocked off of hp
It's also tracked to -1xFP as per Basic pg 426, at 0 FP
or less you lose both FP and HP when ever you are caused to lose FP and there is a risk of passing out if you do anything besides Do Nothing*. Once you hit -1 x FP you fall unconscious, no roll, no further FP lose (it's all HP at that point). At 0 FP or less if you go uncoscious from FP lose (failing a Will roll or hitting -1 x FP) you only regain consciousness if regain positive FP.
Or magic is used, I presume.
* Which is why Jednesa passed out. Unlike Jareth, she couldn't make the Will checks.
Hmmm. That's 2 characters out of 3 that hit 0 FP in their first mission. Wonder if we'll go for the trifecta?