The Chiefs are running a version of America's Blitz from a Dime personnel package.
Nickel - Contain blitz
Mike - Show A gap pressure, bail out blitz the B gap
End - Long stick to A gap
Tackle - Long stick to opposite A gap
Nose - B gap to Contain
The end result is a 2 on 1 vs. the running back resulting in a sack. A big part of what makes this concept work is the initial disguise. At this point every offense and pass protection scheme has a plan to block a double a gap rush like the Chiefs initially show. Every offense is also prepared to handle America's blitz. The key to success for this pressure is the offense failing to identify that America's blitz is what is coming. Earlier in the game Chiefs' Defensive Coordinator Bob Sutton showed the same look. The Mike bailed to execute a zone drop off the #3 receiver. On this sack the initial look with two 3 techniques combined with the Mike bailing are both indicators that America's blitz is NOT a threat. This is an excellent example of a defense exploiting an offense's expectations to create a pressure opportunity. Disguising pressure is a topic I've written about in the past. I think disguise is crucial to keeping a tried and true pressure concept effective once opponents have a good scouting report on your defense.