Per Wikipedia, that was no touchdown.

DawgAudit

Redshirt
Aug 23, 2012
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A player is considered down when any part of his body other than the feet or hands touches the ground or when the ball carrier is tackled or otherwise falls and loses possession of the ball as he contacts the ground with any part of his body, with the sole exception of the holder for field goal and extra point attempts. In the NFL a player is active until he is tackled or forced down by a member of the opposing team (down by contact).


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