Necessary Evil Quest - Cant avoid a fight? [KCD2]

Ive tried both snitching and withholding the info from otto yet they still end up killing one another.

Im wondering if its becuase of me saying casually earlier that he left the wedding early in a prior seemingly non-consequential convo. Is that it?

Annoyed because i disliked the burgher and olda but like otto and the old semine :(