Unlike typical d20 games, there are no attacks of opportunity in Spycraft 2.0. Instead, awkward actions and skill uses that might otherwise provoke an attack of opportunity leave you flat-footedA flat-footed character is vulnerable. He stops being flat-footed when he takes an action, or is successfully attacked. or vulnerableA vulnerable character loses his Dexterity bonus to Defense (if positive), as well as all dodge bonuses to Defense. He may also be targeted with a variety of special effects, such as sneak attack damage. and therefore open to enemy attacks until you recover.