Eagle surrounds itself in a light purple ball of energy vibrations. Then, Eagle either attacks right away or waits for the opponent to attack and strikes as a counter attack, hence the name.
It is arguably Eagle's second strongest move.
Beyblade: Metal Fusion
Tsubasa first used this move in Tsubasa Flies Into The Dark. Tsubasa used this move again in Eagle Counterattacks in his battle with Ryuga. It successfully beats Ryuga's Dark Move, Dragon Emperor Soaring Bite Strike.