C2229 Temple Conclave
The two Dragons respectively grasped the 'explosive' and the 'binding' laws.
The Dragon Confining Bow was in fact a Dragon-Prison that had exploded, and was also the legendary one that had stirred up huge trouble. And the Dragon Confining Arrow, was a prison dragon that was being bound.
When they coordinated with each other, they could use either the Erupting or Binding Laws