Jeskai Control relies on reactive removal like Day of Judgment and Fire Magic plus countermagic to survive, so Duress proactively strips these answers before we commit our threats, and it can also take their key engine pieces like Jeskai Revelation or Stock Up. The extra Requiting Hex gives cheap interaction against their few small creatures. Stir Up Trouble's conditional cost is a real liability since they can simply let our creatures resolve and answer them with sweepers like Day of Judgment or Deadly Cover-Up later, so we want proactive discard instead. Umbral Collar Zealot's sacrifice outlet matters less here since the matchup is about resolving and protecting threats rather than grinding incremental value.