You have enough control over your transformations that you can lash out at an opponent while assuming your beast form.
Prerequisites: Shapeshifter Style, Shapeshifter Twist, Beast Shape class feature.
BENEFIT
While you are using Shapeshifter Style, if you use your beast shape ability as a standard action, you can also make a single melee attack with one of your natural weapons at your highest base attack bonus against one foe within your reach.