The Balance guides the actions of a Nexan, they cannot do whatever they want like a chaotic evil does. Fort should treat Nexus characters just like it treats any other neutrals.

-When Light holds the sway over Balance, Fort members can treat Nexans like Fort vokers treat neutral Ragers or Fort dwarves treat neutral Outlanders.

-When Dark holds sway over the Balance, Fort members can treat Nexans like Fort dwarves treat neutral Ragers or Fort vokers treat neutral Outlanders.

Much of it should depend on the individual and how he behaves. It varies how aggressive Nexans are as a function of Balance shifting.