I bet that truth officer is Tilica's father!
Then he goes: "You want my daughter to become your wife?! And not even your ONLY wife but just one of several wives?! OVER MY DEAD BODY! PREPARE TO DIE!!!"
bro after tilica masaru will still have more wife and if i remember one of them is lilica from the elf kingdom
since i'm pretty sure she end up as masaru wife after he rescued the elf kingdom
thought this was the case in the novel as you can see her figure in both wn and ln ilustration
he is her fatherly figure, specifically he is her master who taught her to be a truth official. Tilika parents sold her to the truth palace just like satie was sold by her parents too.
and about the duel thing you are close too
a noble accepted to take Tilika as his first wife, the master travelled to inform Tilika and witness the wedding. Masaru will have to fight said noble which is not actually a bad guy but very, very arrogant.