sentences:  In Week 3 against the San Francisco 49ers, the Steelers found themselves trailing for the first time on the young season as the 49ers drove deep into Pittsburgh territory before being forced to settle for a 32-yard field goal by Joe Nedney.The San Francisco lead lasted exactly 12 seconds, as Allen Rossum returned to ensuing kickoff for a touchdown to give Pittsburgh a 7–3 advantage.The Niners went 3-and-out on their next drive, but they sacked Steelers quarterback Ben Roethlisberger and forced him to fumble on the Steelers' second offensive play from scrimmage.