After a close call against the Jets, the Falcons went home for a Week 16 inter-conference battle with the Buffalo Bills. In the first quarter, the Falcons got straight to work as Matt Ryan completed a 42-yard touchdown pass to Roddy White. In the second quarter, Matt Bryant's 51-yard field goal extended the lead for Atlanta. As the first half was closing, Buffalo blocked Atlanta's field goal and things got crazy as a couple of Bills possessed the ball, but they could not manage to get it into the end zone. In the third quarter, Atlanta extended their lead even more as Marty Booker caught a 12-yard touchdown pass from Ryan. Things got better for the Falcons as Buffalo running back Fred Jackson fumbled the ball, which led Lawrence Sidbury to return it for an 11-yard defensive touchdown as he dragged a few Buffalo players. The Bills finally got on the board as kicker Rian Lindell nailed a 42-yard field goal. In the fourth quarter, Ryan re-connected with White for a 5-yard touchdown pass, as it was too late for the Bills to catch up.
Question: how many yards did sibury return?
Answer: 11