You add the damage to 15 to determine the resistance check DC.  A failure results in a bruised result, a failure by 5 or more results in a dazed result, a failure by 10 or more results in a staggered result, and a failure by 15 or more results in an incapacitated result.  So a resistance check vs. Damage 6 is DC 21, meaning that the worst a character with 10 toughness can get on it is dazed.  (on a result of 5 or less on the d20)<br/><br/>With objects, a failure results in a scratched result, a failure by 5 or more results in a broken result, and a failure by 10 or more results in a destroyed result.  When attacking an unattended object, the attack is automatically a finishing blow, meaning you have the choice between automatically hitting, or rolling and scoring an automatic critical hit (for +5 damage) if you beat DC 10.<br/><br/>As for Blitz' action, I'll assume that she's holding until someone breaks open a way into the bank.  Her speed is such that she can effectively move anywhere with a single move action, and can take her standard action at any point in that effectively infinite move action.<br/><br/>