The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The most valid counter-argument to the description of the Mongols by the Russian duke was that the Mongols were interested only in plunder and treasure but not in controlling the Russian territory.
As we know by reading this part of history, the Mongols were terrible warriors that showed no mercy. They were fierce fighters that indeed were interested in destroying and plunder. And more than conquering and establish a form of government to rule a territory, by the way, they attacked and proceeded, it seemed that they were more interested in becoming wealthy.
Answer:
<em>he would probably mention the new people he met as he "discovered" the native americans. he would probably tell his sponsors about the new lands he "found" and they would try to explore them. His private feelings would probably include all of the views and the different people he saw and how they looked and dressed differently from him</em>