Carr, generously listed at 5-foot-10 and 180 pounds, was the target of an overly aggressive double-team by Denver's Curome Cox and Dominique Foxworth but managed to keep his feet, reach out and strip Williams of the ball and give Oakland possession at their own 48-yard line.
It led to the only Raiders points of the game, a 47-yard field goal by Sebastian Janikowski.
Before Carr reached out and poked the ball loose, his jersey had been pulled up near his shoulder pads and he had been pushed, shoved held and blocked nearly out of bounds. Carr knew from film study Cox and Foxworth would be coming after him.
"The whole time, it was like there were these two piranhas on me," Carr said.
Williams had broken loose on a 21-yard return before Carr made his play, with Robert Thomas recovering the fumble.
"My thing was, `I'm not going to get down there like I usually do, but I'm going to fight, keep battling, so I can get in on the play later on,'" Carr said. "Until the whistle is blown, you never give up on a play. You can't give them the satisfaction of knowing they got to you, that you gave up.
Shell, fielding questions about being the only winless team in the NFL, pointed to Carr's play as a symbol of what it will take to get the first win.
"It was a great effort by an individual player, trying to make something happen, trying to make a play," Shell said. "That's what you need from everybody in the team, trying to make a play. When it's there to be made, make it. And he did that. That's a great, great effort on his part."