Why does the author mention him? To indicate that, apparently, human aid could not save the Emperor.
What has been told us in this first paragraph? The peril of the Emperor.
What is told us in the next? His rescue.
Who else sees the danger? Zyps of Zirl.
Who is he? A famous hunter and outlaw.
Do you see him at first? No, I hear his cry. The author says "Hark! there is a wild cry!" Then I recognize the outlaw.
Why does he utter the cry? To encourage the Emperor and let him know there is some one coming to his rescue.
Again how does the author make the picture vivid? By the use of the present tense, by commands, questions, and exclamations, and by making the spectator, in his excitement, address the mountaineer directly; for example, "thou hunted and hunting outlaw, art thou out upon the heights?" etc.
By what means does the author show how the outlaw comes to the Emperor's aid? By comparing him with the chamois, the insect, and the squirrel. This man combines in himself all their powers of movement.
What does the spectator now do? He fears that all may yet be lost, so he shouts to the Emperor to have courage, that the hunter is coming.