What is a question you can ask when analzying the structure of a text

Which two lines in this excerpt from arthur conan doyle's "the contest" suggest that emperor nero was ruthless? each choice is in brackets. [an hour later the shepherd was well on his way to his mountain home, and about the same time the emperor, having received the chaplet of olympia for the incomparable excellence of his performance, was making inquiries with a frowning brow as to who the insolent person might be who had dared to utter such contemptuous criticisms.] [“bring him to me here this instant,” said he, “and let marcus with his knife and branding-iron be in attendance.”] [“rumours! ” cried the angry nero. “what do you mean, arsenius? i tell you that the fellow was an ignorant upstart, with the bearing of a boor and the voice of a peacock.] [i have half a mind to burn their town about their ears so that they may remember my visit.”] [“i conquered! you are mad, arsenius. what do you mean? ”] [it is whispered that for once the great god pan has condescended to measure himself against a mortal.”]

The play, doctor faustus, opens with a prologue. by describing faustus's beginnings as a child "base of stock" and his end as his "waxen wings" melted when "heaven conspired" to stop him, the chorus subtly calls to audience's minds, as they begin to view the play, the commonly held idea of the great chain of being the pact with the devil the seven deadly sins the renaissance man

What is the most important idea that the authors of the video transcript of dr. x and the quest for food safety and the text did food safety myths exposed want the viewers to understand?