Wormtongue and Saruman in RotK

[The Saucepan Man]

I'm curious about when exactly this is going to happen in the film. It would seem strange to kill off a character who has been so pivotal in the first two films at the beginning of the third.<P>I like the idea of Saruman meeting his end as the film climaxes, but there's not much scope for him and Wormtongue to do much in between. Since it doesn't look like they're leaving Orthanc and there are only the two of them, any more than a few scenes between them throughout the film would become a bit repetitive. Also, they wouldn't really relate to the rest of the story.