Using a Defensive Ability: Defensive abilities attempt to foil the attacks of an enemy or otherwise protect your person from attacks. These can be used once per round per attack you can normally perform
Defensive Power (01-100%) - This number represents the characters ability to resist and deflect the attack power of an enemy with armor, training and spells, and avoid direct damage.
Defending: A defending character can use armor bonus instant actions stances and other powers to enhance defense. These count against their rounds attacks or move actions.