Pitched Battle and Departure

Puzzled, Pang Xing and Thuram looked at where Qin Mang was pointing. All they saw was the several dozen meters thick metal flooring, which had been deformed by Xia Fei and Butcher's fierce fight. There were potholes all over, and only the extraordinary stretch of the metal alloy was preventing it from being split.

"That's the result of Xia Fei's fight. What's so strange about that?" Thuram asked.

Qin Mang smiled. "This fight is very intense, and the two appear to be using all their strength with every blow in hopes of taking the other's life, but have neither of you wondered why, in this half an hour, the both of them remain unharmed?"