In a real fight, there is no next time. You can't choose your opponent's strength. Losing would mean death. If a duty-bound person dies, a hundred more innocent people would die. We exorcists cannot die easily, and that is a responsibility.
I know no one expects much from me! And I know better than anyone how useless a C Class hero is! I know I'm too weak even for B Class! I know more than anyone else that I'll never beat you! But I must fight you anyway! I'm the only one left! It's not about winning or losing! I just have to stand here and face you!