Star rookie defensive end Shemar Stewart left the field on a cart during day one of training camp. Instead, he is now sidelined with a serious leg injury that has the whole front office scrambling. Shemar Stewart was participating in drills when the injury took place. AdvertisementAdvertisement AdvertisementESPN reported that Stewart was carted off with a left leg injury. Why This Changes EverythingThis injury is a disaster for the Bengals' defensive plans.