Three men had started charging towards Xin, they all had this spooky greenish energy ball floating above their hands. As they approached Xin, he had decided to use the ability that the system gave him for the Quest. The fire ability. It seems okay for a fight against these guys.
But there was something he noticed as he tried to use the fire ability. His body felt like it was burning but he was able to control burning sensation. He had felt the same thing when he first used his lightning ability, a shock was sent to his whole body. Maybe because of his Mana or something, he was able to control it and the feeling only lasted a minute. Same thing for the fire ability, the burning sensation only lasted a minute.
A while after he couldn't feel the burning sensation anymore, he then proceeded with his task of fighting the men that challenged him.