Let me explain it nice and slow.<br/>You have one action, during which action you can use only one charm, or a combo, or you can use this charm repeatedly if it is reflexive. Your first action was to get on the ship, and then you used perfect Defense against the Dragon-blooded attack. Your action is now, at tick 10, and in tick 10 you used Perfect  Defense to parry the attack of Bast. It's as simple as this.<br/>I think I made it clear who acts when, so it will be easier for you and you wouldn't have to count and to keep track of your actions. You act in tick 10, which is now, and you act simultaneously with Bast. She acted, so it's your turn.<br/>Is it clear now?