A self-imposed, ridiculous challenge— that was the one second was all about when Yun Zhe blurted it out. It was a pretty impossible challenge that shouldn't have happened. No matter how high-leveled someone was, winning over a beast tamer in under one second should have only been a thought. But for Yun Zhe, it was the reality, and he did it in front of everyone the moment the referee signaled the commencement of the match.
Technically, Yun Zhe won, but it shouldn't have been allowed due to how he did it. It was plainly clear that Claire was still not yet prepared when the signal was given, and Yun Zhe took advantage of that fact. In the end, this was what gave him his win in the second round of the Official Beast Tournament.