SEATTLE — Three plays were all it took for Dallas to get yet another injury scare surrounding Tony Romo. The quarterback lasted just 90 seconds into the Cowboys’ 27-17 preseason loss to the Seattle Seahawks on Thursday night before leaving with what appeared at first to be a potentially significant injury, but ended up being minor. Romo was tackled from behind by Seattle’s Cliff Avril on the third play from scrimmage as Romo scrambled from the pocket. He immediately grabbed at his back, crumpled on the field while trainers sprinted from the Dallas sideline and images of Romo’s injury problems from last year immediately flashed to mind. Turned out it was all just a scare.