Why does he go back to...
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Las Vegas in the end? I mean, he is obviously now on the run. There were even sirens at the end. He had nothing left in Vegas except to go kill Les his old boss or to pick up Andrea, who obviously wasn't worth his time since she couldn't even say she wanted to be with him. I guess it's about the girl, but is going after some girl that rejected him worth getting caught by the cops?