Magnus knew Dimitri was a good dragon, but with all the things that had happened to him over the years he may have been able to hide certain things about his personality. Dimitri often did things his way finding that the laws his father and nobles agreed upon were to easy to punish or get out of depending on your station. Dimitri wanted to even the odds by making sure some of the good merchants could keep their business without the large, more profitable stores pushing him out.
While the good things about his personality showed more then the bad it would seem to Magnus that there were still some unresolved issues he needed to work on. "It would seem you two have some explaining to do. Why is my daughter running from you? What could possibly cause this kind of treatment?"