Boss or not, a Suikoden Mage is a Suikoden Mage. Those are not noted for Outstanding Durability in the face of papercuts, let alone a former Godlike's physical that also happens to ignore evasion. Sarah can.. uh.. burn things. Slightly.
Yeaaaaaaaaah try again, wench. Galcian's gonna kick your ass, kick Yuber's ass for trying to upstage him in the style department, then have Ramirez kick Luc's ass just for being Luc.