Because once Barwicki talked to Roger and asked him to stop, then Barwicki would "know" Roger. And then when Barwicki was LATER asked, "do you know Roger", instead of saying "no", he would have said, "yeah, I know that SOB. I called him once to ask him to stop". But that's not what he said. He said "no, I don't know him".
I don't know, it just doesn't sit right with me. But that's just me.
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