Gravis had never been so shocked and shaken up in his life. He had challenged Heaven to a fight, and Heaven had just demonstrated to Gravis that he wouldn't even be able to react to an attack. If Heaven had targeted Gravis with this attack, he would have immediately died.
What had he done?
Yet, after some rationality returned to him, he realized something.
"This was not a level five Law," Gravis said with narrowed eyes. "There are no level five Laws for a middle world. The only level five or level six Law you should know is the next level of lightning."
Heaven continued to look at Gravis evenly. "You are half-right," Heaven said. "This was not a level five Law, but the attack had the power of a level five Law. Yet, you were incorrect in saying that there are no level five Laws for a middle world. There is one, but not even I know it."
Gravis remained silent but was shocked. There actually was a level five Law for the middle world?
Before you blame Gravis, look at yourself.
Would you have made the same choice as Gravis and fought Heaven?