Xiao Ming had intentionally feigned ignorance to trick Yu Jingtian into believing that he was unaware of his presence.
However, what could escape the sense of one's own environment?
Xiao Ming's aura was at unity with the environment so he could easily perceive even the slightest frictional actions not to mention something as vague as killing intent directed towards him.
Yu Jingtian felt a wave of shock at first because Xiao Ming's immediate gaze on him after he released his killing intent for the latter from such a great distance.
But he relaxed afterwards because it only looked like Xiao Ming was only giving a 'curious' glance towards his group like the others –mysterious black robed and hooded figures.
However, he still wasn't scared as he had a shocker for his enemy that he believed would be a sure kill unless Bai Lingxu or Bai Xinyu intervened.