At this kind of distance peeping on them, Wu Jinliang wasn't afraid of being noticed. The grand Array cut off Mana fluctuations, and the environment on Yanfu Continent made sounds hard to hear. As long as he was careful, sneaking up this close still wouldn't get him caught.
Most importantly, the grand Array was there to protect him. Even if they did discover him, so what? There was nothing they could do to him.
And because he was close, he could hear the group talking as they cast their skills, which he found pretty amusing.
As for practicing and imitating Yu Yifu's appearance, it was because he wanted to get close to Li Hongjiu and get the intel.
