Watch the video and look at where their safeties were playing. There were eight defenders within 7 yards of the line of scrimmage, slanting and run blitzing. They did the same thing Pitt did. The counter to that is to hit a few streaks, or to get wide quickly. I kept wondering why they didn't run a bootleg, which seemed available the entire second half at least. Turns out they were saving it for when they felt they needed it.