Instead of "you are making use of him", you should write "you are taking advantage of him"
All in all, still a very good translation! Thank you very much and please keep at it!
The trope of the one sided duel is so annoying. I don't mean a one sided fight. I'm talking about when the duel is agreed, upon only one side has made demands. What happens if the other guy wins? Nothing! He fought for absolutely no gain. It's lazy writing.