出鬼入神

Explanation: That is very dynamic and unpredictable. 　　Source: Song of the question, "Songshan Heavenly Gate song" Song Xiu move forward, left and right easily change; wind clouds, the demons and attentively. " 　　Examples: "Quiet Night", "far parting" and other articles, ~, disappointed suddenly unpredictable. ★ Ming Hu Ying-lin "in the archaic poem Tau"