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Referee Mike Carey originally signaled Oakland's possession, but then the Chargers were flagged for illegal forward pass. Even with the 5-yard penalty for the illegal pass, the Chargers still had a first down, at the 32.
Four plays later, LaDainian Tomlinson threw a 19-yard touchdown pass to Antonio Gates to tie the game at 14.
While the call was questioned on the field, NFL Supervisor of Officials Mike Pereira confirmed to ESPN's Chris Mortensen that the call was correct -- and not without precedent.
It is illegal to intentionally fumble a ball forward and, by rule, an illegal forward fumble is an incomplete pass. That makes it a dead ball. A 5-yard penalty is then assessed from the spot.
Jackson spinning the ball forward when he was not down by contact constituted an intentional illegal forward fumble and thus an illegal forward pass. Had he spun it backward, it would have been a live fumble.
A similar call was made when Plaxico Burress did the same thing with the Steelers on Oct. 1, 2000.
Information from The Associated Press was used in this report.