<span>Assuming that this is referring to the same cartoon that was posted before with this question, its purpose is to "</span>support nativist anti-immigration sentiment" since it paints immigrants in a bad light.
There were many significant political changes which Diocletian enacted. One important thing which happened was that he divided the Roman empire into two parts. This meant Rome was being effectively taken care of by two different emperors at the time for that reason.
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He wants Zaroff to feel like he's being hunted. Rainsford has now tracked him down and his him on an even playing field. Zaroff is now the one who has to fight to stay alive. Aside from this, I think an ambush would be pretty difficult. Rainsford is unarmed and Zaroff is tucked away somewhere in his great chateau. A sneak attack probably wouldn't be successful.
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