This is what can happen when you lose an offensive lineman.
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After being back up by a penalty and then a tackle for loss, Seattle quarterback Russell Wilson dropped back for what was a snap near his own endzone. Right after Wilson took the snap, though, reserve offensive lineman Rees Odhiambo stepped on Wilson's foot, causing Wilson to fall down in the endzone for a safety.
Odhiambo was in the game after rookie offensive guard Germain Ifedi was injured earlier. Ifedi later came back into the game the next time the Seahawks got the ball.