They’re watching their backs. The University of Alabama has become a pipeline pumping safeties into the NFL: No college program has sent more of the defensive backs to the pros. Head coach Nick Saban’s firsthand tutelage has been key, as players get detailed instructions from the guru — and former safety — including professional-level strategy. “Their defense is an NFL defense,” says ESPN’s Matt Bowen. But with a slew of defensive backs ready for the NFL draft, the Crimson Tide is now looking to reload the position.