[Corinthian]

I think you are all overestimating the dangers of magic duel to a rainbow site searcher. You only need to give the rainbow two pearls and have him scripted to cast returning. (thaum 1?)Because he as the defender gets to cast first he will be teleported back to the capitol and the would be assassins will be eaten by the PD.

Only combat pretenders are vulnerable to magic duel, really.