Earlier, it did not cross Qin Yu's mind to probe Duan Ling Tian's cultivation base at all. After all, he was convinced Duan Ling Tian was not as strong as him and that Duan Ling Tian's feat of advancing to the ninth step was just a fluke. Moreover, he did not think Duan Ling Tian would have a breakthrough in the Heavenly Stairs. The only reason he had decided to probe Duan Ling Tian was due to the sense of unease he felt when he saw how calm Duan Ling Tian was even after they had arrived in the Extreme Martial Arena.