Mortus isn't sure what she can do. She can't burst into the ring. The combatants have already been vetted by wizards [it would appear] so vetting them again seems a little pointless. If they passed the first time it is reasonable to assume that they will pass the second time.
It is likely that she will connect the magic to the King and setting off a greater demon in such a crowded area doesn't seem like a good idea.
It is also reasonable to assume that if she can tell that there is magic being used then the Law Lord who is a wizard can tell as well. Therefore if he accuses the challenger of using magic and the Law Lord denies that it is true who do you think is going to be believed???
Last time Mortus accused somebody of using magic she was nearly killed. It might not seem to her to be a very good idea to do it again. At least not without something to support her claim. Admittedly Klaus doesn't know about that experience so I suppose it is understandable that Fandir didn't factor it in.
She is considering if somebody might torch her if they find out she is a mage...even though gazillion people already told her that it isnīt working that way in the Empire especially not in Middenheim but hey......making up your own fluff in games is sort of fun....for the rest of the group.
Julian certainly is enjoying himself immensly.
You will forgive me I am sure if I think role-playing is more important that min-maxing in a role playing game.
Julian will be grand, it is very unlikely that he will die.