Russell trying to read the D's blitzes

This is one of the first games I remember seeing Russell consistently act as if we were going to snap the ball only to stop to see which players were coming on the blitz. This is obviously a good thing however I did not see a lot of plays being changed to pick up the blitzes or at the very least check down to some quick slants. Also how about a screen pass call once in a while to take advantage of the incoming blitz?