Baltimore Ravens quarterback Joe Flacco throws to a receiver during the first half of an NFL football game against the Houston Texans, Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Gail Burton)

Houston Texans running back Arian Foster, left, rushes the ball as teammate Ryan Harris, center, blocks Baltimore Ravens linebacker Pernell McPhee in the first half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Gail Burton)

Houston Texans running back Arian Foster, bottom, is tackled by a pack of Baltimore Ravens defenders in the first half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens inside linebacker Daryl Smith, right, intercepts a pass attempt in front of Houston Texans tight end Owen Daniels in the first half of an NFL football game, Sunday, Sept. 22, 2013, in Baltimore. Smith returned the interception for a touchdown. (AP Photo/Nick Wass)

Houston Texans quarterback Matt Schaub (8) throws to a receiver as he is pressured by Baltimore Ravens outside linebacker Elvis Dumervil (58) in the first half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens inside linebacker Daryl Smith runs an interception back for a touchdown in the first half of an NFL football game against the Houston Texans, Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Gail Burton)

Former Baltimore Ravens linebacker Ray Lewis, left, and Houston Texans free safety Ed Reed chat during halftime of an NFL football game between the Ravens and the Texans Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens running back Bernard Pierce scores a touchdown in the second half of an NFL football game against the Houston Texans, Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens outside linebacker Terrell Suggs (55) celebrates with defensive tackle Haloti Ngata after Ngata sacked Houston Texans quarterback Matt Schaub in the first half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)

Houston Texans free safety Ed Reed, right, tackles Baltimore Ravens tight end Dallas Clark as he rushes the ball in the first half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)

Houston Texans free safety Ed Reed looks on during a break in play in the second half of an NFL football game against the Baltimore Ravens, Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Gail Burton)

Baltimore Ravens wide receiver Torrey Smith, left, rushes past Houston Texans free safety Ed Reed in the second half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Gail Burton)

Houston Texans wide receiver Keshawn Martin, left, can't hold onto a pass attempt as he is pressured by Baltimore Ravens cornerback Jimmy Smith (22) in the second half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Gail Burton)

Houston Texans running back Arian Foster is tackled by Baltimore Ravens strong safety James Ihedigbo in the second half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens wide receiver Torrey Smith, left, rushes past Houston Texans cornerback Kareem Jackson in the second half of an NFL football game Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens wide receiver Torrey Smith, left, reaches for a pass attempt as he is pressured by Houston Texans cornerback Johnathan Joseph in the second half of an NFL football game, Sunday, Sept. 22, 2013, in Baltimore. The pass was incomplete. (AP Photo/Nick Wass)

Baltimore Ravens head coach John Harbaugh is seen past officials and players as he looks on from the sideline in the second half of an NFL football game against the Houston Texans, Sunday, Sept. 22, 2013, in Baltimore. (AP Photo/Nick Wass)