I'm kind of curious if this guy's gonna be related to Sir Anvas, the knight who was executed at the same time that Beramus was abandoned (supposedly for "kidnapping" Beramus). Could be that that wasn't a lie Renest made up in the moment to Liza (where he was executed for a different reason, but he just lied about it to Liza), and instead it was part of a cover-up Renest made back then, so this guy could hold resentment towards Renest over that + also know that Liza's telling the truth here since he probably would've been involved in the investigation.