During the third challenge, Saturius used the Icarian Scroll I gave him before the challenge against Kelmello began. From what I've watched and read, Kelmello should be high up into the air when the spell was cast and immediately surrender upon taking fall damage. Saturius however casted the spell and Kelmello would only jump a few heights then fall. This ultimately locks the next stages of the quest. I tried using a jump spell on Kelmello and it did work, and Saturius won the challenge, but as I entered the tower where Saturius is I couldn't find him and had to use the console commands to place him in that cell.