Within a few moments, Ray's mother had gained the upper hand and had thoroughly beaten the enchantress black and blue. Her ever spreading charm seemed to have diminished while looking at her right now, she was nothing less than a being only left to be pitied. Even that would not be likely as Sirius was sure that Ray's mother wont let her get even that.
He had seen how dangerous Ray's mother was and that how resistant she was to charm and therefore, he was sure that she would deal with the enchantress in her own way. Also, it was not that the enchantress was weak but that she had the worst possible matchup she could have as not only did a huge portion of her abilities didn't work against the same sex but also that her attacks were suited more against close ranged combat in which she used a mix of her charm and illusions to fight. The enchantress was someone who loved to drag out battles and slowly turn the opponent into her thrall but alas, she failed and miserably at that.