The St. Louis Rams' run defense and Ryan Williams, the Arizona Cardinals' starting running back, were a classic stoppable force/movable object situation going into Thursday Night Football Week 5. Fantasy football owners who bet—hopefully out of desperation—on the stoppable force were disappointed in the first half, with Ryan Williams managing just 26 yards on 10 carries against a run defense that made world-beaters of Kevin Smith and Alfred Morris earlier in the season.
Williams, a second-rounder back in 2011, ruptured a tendon in his knee in the preseason that year, costing him his entire rookie season. In 2012 he's gotten a number of opportunities—amplified by Beanie Wells's turf toe injury—but he's been unable to capitalize on them.
William Powell, the Cardinals' second-string running back, managed one carry for seven yards behind Williams, so even this lukewarm performance is unlikely to trigger major change. If Williams is unable to do anything with the ball, the next choice isn't a running back—it's even more attempts from Kevin Kolb, whose arm could probably use a break at this point.