Before he was hit by Yman's Noble Rat Fire Doll attack, he shouted, "Vulca!" Kiko suddenly cried out and after he did that the intense mana exploded from his body.
The Noble Rat Fire Doll disappeared as soon as the intense mana pressure that burst from Kiko's body hit it. Suddenly, the spectators fell silent and everyone stared at the stage with dumbfounded faces. Everyone also felt the shaking of the stage as if an earthquake had passed. It was only then that everyone knew how strong the mana that Kiko suddenly released was. However, what Kiko did could have also caused harm to him. It was a reckless move!
Kiko knew the danger posed by what he had done. But it was more important to him to win this battle than losing in an embarrassing defeat. Kiko can't stand being beaten like that.
What he shouted was exactly the name of his System Deity who looked like a salamander. His shouting was a signal for them to use their advanced resonance.