Back in Conde Petie, either
the fellow blocking the exit upstairs or the pair by the weapon shop
will tell
you to speak to His Holiness, who should be in the hall outside the
inn. Apparently you have to undergo a marriage ceremony to be
permitted to pass the gates of the town and proceed to the
Sanctuary. Much to Zidane's surprise, Dagger agrees to do
this. After the ceremony, you must talk to the twins at the edge
of town.
(You can choose for Vivi and
Quina to marry also, but
please don't do this. I think her interest in him is more
culinary than matrimonial. Oh, by the way...."man an'
woman." See, I always thought Quina was female!)
The twins agree to let the
married couple through, and then chase off
after the thief. In the commotion, Vivi and Quina can sneak
through undetected.