No one knew what kind of torture the seemingly relaxed Thales was going through at that moment.
When he fell on the ground, the feeling of weakness and pain made him suddenly realize that he forgot Black Sword's last lesson: The Sin of Hell's River would always release more energy than what the body could handle.
Even though Thales spent six years' time observing the Power of Eradication of the Star Killer down to its last detail, he still needed to pay a large price when he imitated the Twist of Fate. Earlier, when he was trying hard to defend against Nicholas, the energy he spent surpassed what he usually did, and the burden his body suffered was also difficult to imagine.
His hands and legs had been broken by the Star Killer. When he lay on the ground, he found that he had used up too much of his energy and he did not have enough to recover his strength. And yet, he was severely injured and needed to be treated.
