From a different log above

An enormous giant cuts off Lohakahn's route of escape with his polearm!
Lohakahn is convulsing on the ground.

<673h 308m 961v 24095tnl 7 PM new outdoor civilized raining fighting>

An enormous giant tears Lohakahn's flesh with a wide, slicing blow from a large, crimson-stained halberd!
An enormous giant's slice devastates Lohakahn!
Lohakahn is DEAD!!
You land the killing blow against Lohakahn.
Lohakahn's arm is sliced from his dead body.

Slave using spec skill and slice


So, that being said. A slave or merc cannot dual wield a weapon if they have a spear/staff/polearm wielded. If they have anything mainhand wielded you can add any offhand weapon to it with dualw (weapon)

There's other tricks I could tell you but won't because they're my secrets and I don't discuss them on forums.