Game Mechanics: Duel Wield not working w/o primary weapon equipped

[Heebo]

I was messing around in a duel earlier and noticed something odd. When your primary weapon isn't equipped, you won't be able to hit with your secondary weapon, you only punch. Furthermore, if both weapons are removed, you won't punch with both fists, just the primary. Sorry if this has already been discussed but I couldn't find anything on it.