For whatever reason, the enemy got a lot faster when they entered the atmosphere. Maybe it was because he began flapping his wings, or he needed to feel his weight under the gravity. Nevertheless, Billy decided to use that against the enemy and he didn't have any idea what Billy was plotting...
When Zajoth got too close and thrust another spear toward Billy's head, he slightly moved to the side and then punched the chin of the enemy. A perfect counter… Zajoth got dizzy, and he began to spin in the air while he was moving forward. Billy had planned to chase him, but the impact of the punch created a powerful shockwave that sent him in the opposite direction… It was the first time that he tested the power of his new armor, so it couldn't be helped that such a thing would happen.