The running back suffered a knee injury late in the first half of Detroit's 25-21 loss to the Arizona Cardinals on Sunday. Bush attempted to return to the game to start the third quarter, but he lasted just two carries before sitting for good.
"It's too hard to speculate on injuries," Schwartz said. "That's why I usually don't."
Bush's exit coincided with the Lions' offense grinding to a halt in Arizona. The unit was shut out in the second half, managing just four first downs.
Bush brings balance to the attack. Without him, it's the same one-dimensional outfit that stumbled one season ago.The "Around The League Podcast" is now available on iTunes! Click here to listen and subscribe.