Or makes him more dangerous, depending on how you look at it. He is not going to be happy about losing to her. He is going to double his efforts, just out of pure ego and pride. His planning will be less calculated, and more aggressive and pissed off. A chaotic evil enemy is more dangerous than a lawful evil one.

In The Matrix, Neo goes from office computer geek to a flying god by the time the movie ends. Nobody thinks twice to question it.