No matter how Kakashi struggled, the hand gripping him was like an iron clamp, holding his hand firmly in place. Even more absurdly, the lightning capable of producing extreme heat and paralysis had no effect whatsoever on that palm.
Realizing he had no chance of breaking free on his own, Kakashi helplessly ended his technique. The lightning faded, and when Su Yu saw Kakashi give up, he released his hand as well.
"...I lost."
Kakashi fell silent for a moment before conceding. Mainly, the Lightning Blade he had just used was his strongest attack under normal circumstances, yet it had amounted to nothing in Su Yu's hand. It was utterly depressing: his strongest technique could not even break through his opponent's defenses!
Moreover, Kakashi actually had one major weakness: his mana bar was too short.
In truth, while Kakashi's own mana reserves were not exceptional, they were still above average. The problem lay with his Sharingan. It was not originally his, but a gift from someone else. As a result, Kakashi could not deactivate it and had to keep it active at all times, constantly draining his mana.
So that Lightning Blade had consumed quite a bit of Kakashi's reserves. Although it had not exhausted him, if he could not win with a burst of power, could he really expect to wear Su Yu down with his extremely short mana bar? That was unrealistic...
Honestly, Kakashi now felt a sense of fear toward Su Yu-or perhaps despair. It was like standing at the foot of a mountain and looking up at a peak towering into the clouds. You would instinctively wonder whether you could really reach the summit and cross that mountain.
He even had the feeling that Lord Hokage might not be a match for the man before him.