>All assassins dual wield fists if both hands are free, if they have unarmed defense.

Okay, not to doubt The Nepenthe or anything... but are you absolutely positive about this? I kept subtly asking about this (and ignored) all the time when I played Alarith, since it sure as hell didn't work that way back then; looking back at my logs I didn't even once get more than 3 attacks having both hands empty, despite having the unarmed expertise edge, and 3 attacks were few and far between, quite clearly suggesting I was wielding only one hand all the time.

So please, doublecheck?