Dimir Excruciator's key threats like Superior Spider-Man, Uldaros Theorix, and Doomsday Excruciator (6/6) are all above mana value 2 and often above 4 toughness, making Requiting Hex and Erode's land-ramp downside less efficient here. Shoot the Sheriff answers any of those non-outlaw bodies outright regardless of size. Duress proactively takes their Bitter Triumph, Theorix Charm, or Duress of their own before it can disrupt your curve. This keeps your removal suite relevant against their bigger, grindier threats while still disrupting their hand.