You do realize this is the third thread on this video?
http://www.ninjette.org/forums/showthread.php?t=40891
http://www.ninjette.org/forums/showthread.php?t=40444
As has been said, no one actually called the cops. The cop happened to be there, the guy panicked and grabbed the brakes when he saw him. The cop moved the car forward to help block any traffic that could possibly run him or his bike over.