'hand to hand' unarmed
Even unarmed, it is possible to cause damage. One's own fists become the weapons. If an unarmed fighter has nothing in his offhand, an extra attack is possible with the free hand. The 'hand to hand' skill increases the fighter's ability to fight with his own two hands. A fighter well-trained in hand-to-hand can cause plenty of damage, especially combined with other barehanded skills (brawl, kung fu, and many stances). When an attack with your fists gets parried by a weapon, you will be hurt.