A manager sends a vague message on Friday afternoon: "We're making some changes to how things are structured. More details coming soon." No one responds. But behavior shifts immediately. People check their phones more often over the weekend. They wonder what "changes" means. They think about asking for clarification. They decide not to. By Monday, they're holding back on new projects. They're less likely to push back in meetings. They're waiting. No one threatened them. No on