Samanosuke asks, "Nath, could this magic be dispelled by my weapon? Unlocked with a key or spell? Are there any creatures bound to the spell that can be destroyed to unlock the gate?"
" To Dispel the Guard upon this Place
You'd need to be mightier than the fiendish race.
But there is a way to open door
A key based on guardian's flaw
Hidden in what ward desires to see
Then past here may evil flee. "
"A Ward... Cast in Past... We need a spell! A protection from or magic circle against evil!"
Dalamar turns around to face Yuna.
"Is your spell still active? We don't need a person of good, but a spell of good."
Samanosuke rather bruntly assumes that since the creature said, "You'd need to be mightier than the fiendish race. " that means his guantlet should be able to pierce the magic barrier. He goes forwards and tries a variety of known sword-key techniques.