It took me forever to pass it but i came up with my little cheat.So hold B button and use your control pad to walk easier DON"T RUN!when thief -v- looks around For Example,left go to the right or you can hide behind a object like a tree or light post.Most people have trouble next to the waterfall(thief -v-'s lair)when going up the ramp stop on the ramp after thief walks up then keep going and that"s about it so um HOPE THIS HELPS BYE!