That was a mistake. I didn't consider that the spell goes through enemies. I mean, I know that, but it didn't register. Now I'm stuck fighting both, which is proving to be the hardest Demon's Souls battle I've ever had -- the complete opposite of what I was expecting. Penetrator chases me around the arena, lunging at me with little reprieve, and when I get a moment's breath to fire a spell, Biorr snipes me with his crossbow. Penetrator doesn't even consider Biorr an enemy anymore, I'm just on the constant run. What a pain.
I've never pissed off Biorr this much in this fight before. Anyone else?