Retaliation: When an enemy hero or minion strikes the Warrior strike back for equal(or lesser, maybe 2 base line?) damage.
Disarm: When attacked with a enemy hero's weapon take no damage and instantly destroy the weapon in use.
Pummel: When a spell card is activated by the enemy it is fizzled. Doing no damage.
Just to list a few possibilities. Over time all staples of Warrior Combat.