Since a common strategy in that fight is to buff Ramza's Speed and Attack during the fight to be able to reliably beat Wiegraf, this means you start the fight with Belias with a fully buffed Ramza left exactly where he was last turn, meaning it's easy for Ramza to just walk up, and casually one-shot the Lucavi in a single turn.
However, the fight is treated as the same level used for the Duel Boss with Wiegraf, meaning any buffs Ramza has remain on him when the fight starts.
