ALLEN PARK -- When word leaked out during training camp that the Detroit Lions were experimenting with some new pass rush formations along the defensive line, fans inevitably got excited.

One specific package, named Grey after the 2011 movie where survivors of a plane crash are stalked by a pack of wolves, particularly interested those who follow the franchise.

The schematic twist comes from the inverse lining up of the tackles and ends, with the big men moving to the edge positions and the ends sliding inside.

But as the preseason progressed, the Lions rarely utilized the package, perhaps trying to preserve the element of surprise for the regular season. In the season opener against the St. Louis Rams, the Lions again opted to keep that ace up their sleeve.

Defensive coordinator Gunther Cunningham wishes the team could have used it a little more against the Rams.

"We've worked on it and I was actually disappointed we didn't use it more," Cunningham said. The line kind of calls things and for some reason it didn't get called. I told them call it or I'll call it. They like it. The game was so tight, it was difficult to get in some situations, but they're very good at it, and we're going to use it a lot more."