‘There’s no doubt the Bills have a lot of holes to fill defensively, and with a new scheme to learn there could be some bumps in the road in the early going. But with a system that’s designed to let athletes be athletes the Bills run defense figures to improve. "We know the importance of having our players knowing exactly what to do," said Fewell. "We talk about mental errors and cutting down on them in the football game so our players don’t have to think a whole lot and can play fast."’