Jack plummeted further and further into a rage, instinctually gaining speed and power.
In contrast, Trank was gradually losing more health and mana with each exchange. Though he could evade attacks, he couldn't fight the overwhelming heat that Jack's flame body produced. And he couldn't fight back either. Jack's sword had already melted and been forgotten while Trank's claws were gradually melting from being in such close proximity to Jack.
No matter how he thought of it, Trank knew that he had driven himself into a corner that would most likely be his end.
Not paying attention to the serious terror that Trank was revealing with his face, Jack attacked again and again with reckless abandon. All that mattered was that Trank was still breathing and he needed his life snuffed out.