Sudden Bite
Druid Utility 2
When your foe drops to its guard, you change into a beast to strike.
Trigger: An enemy provokes an opportunity attack from you.
Effect: You use wild shape to change into beast form. You then make the opportunity.
Sudden Bite is a 2nd level Druid utility power. When the user makes a opportunity attack, they use wild shape before. [PrP:40]