Having not seen the episode in years, I'm basically just guessing on my theory.

I was guessing that the hyena's that were being used in the ritual were all female due to them having more 'power'.

I just kind of figured they used a pack structure opposite of what the slayerette set up was. Also part of the ritual was an act of aggression, and the guys were being more aggressive than the lone female that was there.

I don't know if this makes sense. Maybe I'll try again in the morning.

Shoot me, stuff me, mount me.