As HP goes across Alt Forms, I would say in likewise manner all banes would too.
This makes sense from a balance format as well.
The official ruling, however, would be “That is up to the GM as to what makes sense for the world and for that particular Character and the nature of their Alternate Form.” Which means a discussion between the player and the GM.
My suggestions would be:
- The player cannot turn back b/c of the obvious possibility of death
- The player can turn back, and like with HP, instead of being at 0, you are at 1, instead of 6+ fatigue, you are at 5, 1 away from death. Now this wouldn’t get rid of some of your Fatigue if you turned back again, as that would be clearly cheating, but any fatigue levels recovered would be recovered across both.
It’s a bit more tracking and figuring you have to do with #2, but it can work.
There could be a third option, again, if it was something that made sense for the particular way that your character alt forms.
Banes on one form stay on that form. However, this would mean that if you switched forms, you wouldn’t be able to recover from any banes until you switched back and worked on it in that form.
The vast majority of cases this wouldn’t make sense, but I could see it maybe working on some very fringe cases for strange worlds, or the ways things work between planes or what not.