The final battle between the two occurred when Grey tricked Biotrog and was able to capture him. Although, he did not want to hurt the innocent, he viewed Biotrog as a threat. However, it was Grey who was tricked as it was the Red Ninja posing as Biotrog who he has captured. Biotrog appeared shortly and they fought. When it was clear that Biotrog would win the battle, Grey conceded (KF#40-41).
