Inspire.

Yang Dao was sitting on the step with his eyes closed. He was comprehending what happened just now. The boy could tell that the scene in front of him was not reality. Because the killing intent was locked onto him but it did not give him the threat of death. 

He sat down and recalled the way to see through reality and illusion. An answer came to his mind, the fluctuation in the spirit energy. However, the solution was not so simple. There was a difference between the spirit fluctuation between the real objects and illusion. The killing intent he just sensed a bit ago fooled him. 

This was the thin barrier between reality and illusion. Yang Dao wanted to see through this barrier, he wanted to see find out the tiny difference between real and fake. Upon pondering a method came to his mind. Resonance of spirit energy fluctuations. Real objects will resonate with real objects and fake will resonate with illusions.