Why did Vosen lie that he was in his office?
And why did he ask why Bourne would doubt it?
Just a few minutes earlier, he knew that Bourne was watching them. And when Bourne didn't show up to where he said he'd meet Pam, surely Vosen must have known that Bourne could at least still see him if he was still there?
Oh, he knows I'm not in my office... how strange...
Not really!
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