Foster's touchdown gave Houston a 14-6 lead over the 3-4 Bills. Buffalo answered about four minutes later when Rian Lindell knocked home his third field goal of the game, this one from 39 yards out.
With just one quarter left to play, Foster is the game's leading rusher with 74 yards. C.J. Spiller has 39 to lead Buffalo.
Aside from trailing by five points heading into the fourth quarter, another concern for Buffalo is the health of cornerback Aaron Williams. The two-year player out of Texas hurt his knee early on in the quarter and his return is doubtful.