Adam and Shinka had been dominating the battle against the Grandmaster Level Evil Soul, but it was merely because the Evil Soul had been holding back.
They knew that, but if the Evil Soul were to unleash all the Evil Soul Power it had accumulated in a short amount of time, it was likely to severely damage itself or even push itself to the brink of destruction.
The Evil Soul Power was yet to be completely absorbed and digested by the Evil Soul, while it also couldn't handle that much energy yet.
However, Adam and Shinka's overwhelming and coherent attacks pushed the Evil Soul to release its full power and had been infuriated to the point of wanting to kill them no matter the cost.
Adam and Shinka who had been launched flying back were shocked by all the Evil Soul Power within the Evil Soul they were facing and the Evil Soul became shrouded in darkness.
It also grew in size, and no longer resembled a human in any way.