starting to get kind of dark. and that's when i heard another gentleman run up to the area and began throwing punches as well to him. >> out of nowhere a man runs around in front of officer's anderson's cruiser and starts fighting mallory. >> as it turns out it's a plain clothed detective from nearby east moline, illinois, as luck would have it, detective jim weekly is on his way to meet his wife for lunch when he sees the incident unfold. >> i'm slowing up making sure the officer goes wrong. and that's when i see the glistening of the taser wires. >> detective weekly race ls -- races around the front of the cruiser and is shocked by what he sees. >> get the [ bleep ] off him! the first thing i see is every officer's worst nightmare. i see the officer on his back. i see the suspect punching him very fast and violently to the face. >> without hesitation, he joins in the melee.