"He'd just recorded his fifth sack of the season, a first-quarter takedown of Oakland quarterback Jason Campbell for a one-yard loss. But one play later, on third down, Texans outside linebacker Mario Williams was running off the field at Reliant Stadium, hardly moving his arms.

Williams never returned, and for the second game in a row, the Texans lost a key, possibly irreplaceable player. Last week, it was Andre Johnson falling to the turf as if he were shot, his hamstring at fault. Following a procedure early last week, the wide receiver estimated he'd be out at least another week, which means he won't play against Baltimore.

How long Williams will be out remains in question - as does whether or not the Texans can withstand his loss."