No Screens or Draws vs. Vikings

This may be over simplifying, but typically screens and draws are generally go-to ways to counter blitz heavy schemes. Saints did not run a single draw or screen yesterday. Some of of this could have been dictated by down and distance, as neither are designed to pick up a 3rd and 20..... but not a single one called all game? You'd think in game planning for MN that these would definitely have been featured on the call sheet. Perplexing......