"Training," he replies, which is the very, very short version of "a lifetime of hard work."

Zhou Zishu is one of the strongest and most skilled martial artists of his generation and he is well aware of it--but this isn't his home, and he doesn't know even half of what he should, here. He has no real understanding of the politics at play, the people of interest, or what a general standard of martial ability is. Thankfully, it looks like he's still more than capable of holding his own, even if he's fighting strange and unusual creatures.

"You made it across well enough yourself," he then allows, after a beat. He's not accustomed to being overly (or at all) generous with praise, but he's admittedly rather impressed with the other man's ability to keep up with him.