Oh, so he can't use his levels and skills he attained in other worlds... which would explain why Larc's team was grinding when they came to Raphtalia's world.
@Kaarme He could probably scrape pieces of the jail bars, feed it to his shield, then gain a shield that powers up the longer he stays in jail or something. Then scrape of pieces of the wall to get a shield that allows him to make a prison within a prison that slows down time so he can do a training montage of staying in a jail within a jail for years(but is actually minutes outside his inceprison) to power up.
All the while the fangirl is chanting the name of the bow hero to his ears.