Example 1: Blindsided by a scheduled print
A trader takes a clean technical setup, unaware that a major inflation report is due two minutes later. The print surprises, price gaps violently against them through their stop on a widened spread, and a good-looking setup becomes a bad loss, not because the setup was wrong but because it was taken into a known risk window. A trader who had glanced at the calendar would have either waited until after the release or sized down, treating the scheduled event as the dominant risk it was rather than being ambushed by it.
