[Edi]

Valerius, Lugh not having stealth is as it should be, so that is not a bug. I don't remember him ever having stealth, but someone may have given it to him in a frequently used mod.

Originally Posted by Bananadine

That almost makes sense... the unit still holds the staff in one hand and gets necromantic advice from it, but cannot swing it as a one-handed weapon because it's too long.

But then, how is there room for the Fist weapon still, when the one remaining fist is presumably holding the staff? Maybe the staff is strapped to the unit's back... or maybe it's just a bug.

Strictly speaking, that's a bug that has to do with equipped items and item slots, but the contextual explanation is that the mage uses the staff whenever casting spells and holds it in his hand. When someone comes at him, he sticks it in the ground and starts fisticuffs, after which he will pick the staff up again for greater power.