[BluffTHIS!]

Party has no rule keeping players from coming back after leaving for one hand with less than they left with. Although some players seem to find this frustrating because they can't win all the money back from that particular player they lost to them, especially if that player is very looose, you should really be glad they play like that. It means that once you build up a stack they are no threat and can't bluff effectively. Also they can't take off bigger stacks accumulated by other fish making it more likely that you will be the one to get it.