I imagine this is obvious to anyone who's reads Malus' past comments on duels, but it isn't going to happen. Not in a million years. People have very personal opinions about duels, but it's a feature of the game that I feel has been twisted by weird, anachronistic notions of romanticized nobility, like Aaron Burr dueling Alexander Hamilton or something.
"You shall retract your slander!" 'I refuse!' "Sabers at dawn, sir!"
No thanks. I created the idea of blood debts exactly because it seemed stupid for a duke/ruler/priest to go dueling knights, lords, and lower nobles. A man or woman of power doesn't, IMHO, whip out a sword and demand satisfaction. They leverage their resources to suffocate, kill, or drive off their enemies. Ain't that right, Brom/Ramiel/Norrel/Arundel/Finsternis? I think Malus even made that comment to Brom, when he came knocking for a duel.
"Pick up your sword!"
'But I have a thousand. I have an army.'