>>1191
I think it has less thematic content than the books did. The theme is hope in spite of not seeing any way forward. The 'exorcism' Gandalf performs is a metaphysical one, not something like a magic spell.
Movie: Saruman is directly possessing Théoden like a puppet, made possible with Wormtongue's help I guess. Gandalf points his staff at him and exorcises the control over him with his powers.
Book: Wormtongue's council has made Théoden lose all hope, he can no longer see the light nor any way to avoid ruin. This physically manifests in Théoden's appearance because spiritual health or lack thereof is always outwardly evident in Tolkien's work. Gandalf shines light through the window, and then brings Théoden outside to see the sun and breath the fresh air to cure him.
The book version I gave is important because this is the same way Denethor was corrupted. If you lose hope you are conquered by the darkness. This is something many of the characters have to overcome.
>'Now Théoden son of Thengel, will you hearken to me?' said Gandalf. 'Do you ask for help?' He lifted his staff and pointed to a high window. There the darkness seemed to clear, and through the opening could be seen, high and far, a patch of shining sky. 'Not all is dark. Take courage, Lord of the Mark; for better help you will not find. No counsel have I to give to those that despair. Yet counsel I could give, and words I could speak to you. Will you hear them?… I bid you come out before your doors and look abroad. Too long have you sat in shadows and trusted to twisted tales and crooked promptings.'