LAST EDITED ON 09-10-07 AT 08:40 AM (EST)It's an automatic eviction for whichever original nominee remains on the block. That's why POV is so dangerous at F4 -- if the right person wins, there's no defense against the eviction.
Edited to add: I think this actually happened in Season #4, but that's trying to remember the coverage threads -- I didn't watch that one.