When Li Yao was going to hide himself, he was never fond of the best observation points. In many cases, he even abandoned the second-best observation points.
The reason was simple. There could only be one or two best observation points in a complicated area. It was very possible that the place that he had got his eyes on was somebody else's favorite, too. Would it not be quite awkward if the two parties ran into each other at the same observation point?
Therefore, not only did he abandon the best observation point, he had also left a few 'gadgets' in the place, building what could almost be called a trap.
He had not been certain that a third force would come other than Tang Xiaoxing and those who attacked her.