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V: "Don't shoot me, please! It's him! It's him!"
There were many men wearing Fawkesian masks at BTN tower. But who was the one V pointed for the police, making them believe that he was the real V?
Answer: Fred
The police make Fred, the security guard, get on the knees. And when they remove the mask, we see him with a rubber ball in his mouth preventing him from talking. After V kills the cops, Fred faints.