I may be mistaken, but did he not just turn himself into a primal, not summon thordan? He retained his own conscience it seems, rather than taking on that of the primals. It seemed a twisted summoning at best, given that he became the primal, rather than creating it. Its not inconceivable that there was a good amout of prayer directed to the archbishop himself. But I am fairly new to the loore forums and still picking stuff up.