Well, you made it sound like it was
soooooooooooooooooo terrible that he ignored her advice to stop. But you're not the only one; I've heard that claim repeatedly in regard to this case. What is she, an emergency room doctor? Maybe she's a WBF referee and Junta and Costin agreed beforehand to let her referee the fight. She managed an ice rink, for heaven's sake.
I simply disagree with you about what made this manslaughter. I suspect what really made this manslaughter was that the prosecution was careful to pack the jury with, little, politically correct zombies. Wish I had been on it. If I had been, given all I've heard (and I heard much of it), I would never have agreed to a guilty verdict.
It was the rink manager's testimony, and other witnesses saying the identical things, that convicted Junta. So what if she's a woman. So what if her job is rink manager. Junta had an attorney. He had a defense. The defense did not hold up. According to the law what he did is manslaughter.
You'll excuse me if I choose to give the cops, the jury and the judge the benefit of the doubt over your well-considered, I'm sure, opinion.