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Originally posted by: ADigitalMan
Chalk up the silly lumbering to Hayden being in the suit. The guy can't act, plain and simple. I give him props for trying to adopt the speech patterns of JEJ in this movie. That was a subtlety that most aren't giving him due credit for. But on the whole, he just can't deliver dialogue convincingly, and apparently he can't do convincing body work either.
George told him to do that. Hayden told George that he was having alittle trouble walking in the suit and asked if he could practice alittle bit. George told him that it was perfect, as that is exactly how Vader would be feeling at that moment. Unable to fully use his new body, like a newborn stepping out for the first time.
So don't blame Hayden.