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Rabbis disagreed on the incident that led to a decree preventing men from going outside with spiked sandals on Shabbos, but all agree that the harm was caused by panic among a group of people hiding from a common enemy, and that panic led to the people harming each other before the enemy ever arrived. The decree is not so much against the harm that spiked sandals may cause as it is to commemorate the tragic event, and to teach the lesson of keeping a cool head in dangerous times.