Acj's problem is that Pedro is frozen in place after the cut scene when you first enter the Ars Magicana sewer, and can not be targeted with weapons or spells.
BTW Acj, is Pedro still green on your mini-map, or red? If you try area effect spells that do not require a target, like Poison Cloud / Hell Spikes / Deadly Disks, or the warrior's spin attack (if you are a warrior), does he take any damage?
