We don't know what this was about or why it happened -- you will all undoubtedly guess. But your video of Riley Cooper and Cary Williams mixing it up is above.
Williams was lined up on Cooper, Williams jumped over Cooper's back in coverage, the two went to the ground, and then began fighting once they got to their feet. Brandon Boykin broke up the fight and Michael Vick had to hold Williams back from Cooper as the receiver attempted to walk away.
Not in the video is owner Jeffrey Lurie, who was on the field watching the whole thing.
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Worth note is that Williams was not publicly opposed to Cooper's return to the team. He actually made some pretty level-headed comments on the matter, saying he believed Cooper "just made a mistake before questioning the word's use in pop culture, specifically rap lyrics.
UPDATE: Williams isn't talking, and Cooper said after practice that the fight had nothing to do with his racial slur from earlier this summer.
Click on photos to enlarge:
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The music playing at practice is a nice touch. We didn't even have to add that.
Beat tweets:
Looks like Cary Williams and Riley Cooper just had some words at practice. Vick had to separate.
— Geoff Mosher (@GeoffMosherCSN) September 5, 2013
Williams was defending Cooper during one on ones. Got a little physical, began jawing at each other and then got physical. — Tim McManus (@Tim_McManus) September 5, 2013
Wow Cary Williams and Riley cooper go at it at practice... Cary is still pacing like a caged leopard — Derrick Gunn (@TheRealDGunnCSN) September 5, 2013
"I can't believe Cary Williams would be THAT heated to scrap with a teammate in practice," said nobody who's spent 5 minutes w/Williams.
— Geoff Mosher (@GeoffMosherCSN) September 5, 2013
Williams was all kinds of fired up and needed to be held back by multiple players. It's ended for now.
— Jeff McLane (@Jeff_McLane) September 5, 2013
Michael Vick had to jump in and hold Williams back. Cornerback is now walking it off. Cooper has his head down and DeSean is talking to him.
— Jeff McLane (@Jeff_McLane) September 5, 2013