After Lex had advanced, she became much more sensitive to the changing of elements, minor details of mental strength, and the way to control magic chords. What Saleen was doing in that aspects were no different from a sorcerer. The only difference was that his magic chords were still very weak.
In the past, Lex was not able to sense all that, but now that she could, she realized just how unique Saleen's spells were.
Saleen would become even more powerful after he advanced into a sorcerer.
Lex observed Saleen sensing Lex's transformation. Those wings were not just simply made from fire elements, there were wind elements at the same time. With both wind and fire complemented each other and Lex's speed was on par with that of a grade-8 sorcerer.