Chapter 128: Chapter 128 - Fight once again

Well, Allen could have rejected the challenge. But he also wanted to know what will happen when he will face a peak Mortal grade Warrior. He wanted to know if he would be able to win the fight or not. But still, as you know that he didn't want to use the flame body, poison, and flame bullets, or even his bloodline skills. Those are his Trump cards. So he did not want to reveal them that easily. 

If you are thinking how will he be able to win the fight if he did not use the flame body or all of his other techniques? Then he already had a plan of what to do at this moment. Because of this, after confirming the challenge he directly went back to his room.