Tom Cruise wouldn't do this fight because it would be beneath him to fight that little twerp. If you've seen Tom Cruise in last few movies climbing the side of the world's tallest building, hanging off the side of a cargo plane, riding a motorcycle helmetless against oncoming traffic or climbing onto the skids of an airborne helicopter you'd probably know he's not the kind of person who is scared of anything -- especially a little manchild like Justin Beiber.
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