Escaping Thief

There's a bridge near Dadhal. Trilgards are in control of the land beyond the bridge. Recently, a thief of Kuhn committed an unthinkable crime. He stole Magic Square Jewel of Kuhn and crossed the bridge. Mercenaries of Kuhn can't go after the criminal unless it's a simple hunting. So I'm asking you to go there instead. Mine Mystic Eye in the Sealed Mine might have been a witness. Go to him first.

The longer you delay this, the more time the criminal will have to run. Go immediately to Mine Mystic Eye in the Sealed Mine.

A thief? Well... I'm not actually fond of thieves from Kuhn, but I think I should help you out as you've come all the way here. I have some ideas as to how to help.