Deravan saw the white mage, who could possibly cause trouble to the group if he were to stand alive. Miles at least weakened him a lot right now. Deravan moved quickly to try to finish off the white mage.... who saw it coming unfortunately. He dodged out of the way right there. He hoped the others would target him to actually end him, cause last thing they needed was to have the healer heal their party up. He just hoped that things would get better here.
"Someone finish off this dang mage before he causes us trouble!" he then says, hoping the others would help.