Soon as the antlered monarch saw The lord of monarchs near him draw, A while with trembling heart he fled, Then turned and showed his stately head. With sword and bow the chief pursued Where’er the flying deer he viewed Sending from dell and lone recess The splendour of his loveliness.

In plain words: When the deer sees Rama coming, it runs off in fear, then turns to show its head. Rama chases it wherever he glimpses its glowing beauty among the valleys.