Counter Rush

Counter Rush (リベンジラッシュ) is a technique exclusive to Ventus in Kingdom Hearts Birth by Sleep. It allows the user to unleash a fury of blows after a successful block.

Appearance
As you can see from the clip counter rush makes Ven unleash a spinning attack finishing with a slam. He swings his keyblade 360% hitting the Unversed once finnishing with a large slam which causes the most damage (still in a spinning motion) and forced the Unversed away from Ven.

Mechanics
In Kingdom Hearts Birth by Sleep, Counter Rush is a Reprisal Command that has a maximum level of 4.

Kingdom Hearts Birth by Sleep

 * Ventus can purchase Counter Rush from the Moogle Shop for 1200 munny once the command has already been obtained elsewhere.