'It's her?' Athos mentally asked Finn's skeleton, just to confirm. There was no way an ordinary person, even an adventurer or mage could dodge such an attack without warning. Only a mage slayer would have the dexterity and nerves of steel to dodge it.
Finn's skeleton nodded, his entire body shaking as he continued to resist. Normally, the fear of disappearing would have made him stop resisting and made him a spectator of his own body, but the anger at being killed and the concern for Emilia motivated him to resist.
He wanted Emilia to kill the skeleton in front of him, or at least run away and report its existence to the order. Finn hoped that once the skeleton died, he'd get his freedom back or at least he could die for real, rather than become a bony bastard's slave.