Referee asks: How to handle dangerous-looking tackles that miss everyone in 12U soccer

A youth soccer referee describes multiple studs-up slide tackles in a 12U tournament semifinal that missed both ball and player, raising the question of whether to caution/send off for reckless or dangerous attempts even when there’s no contact. The post centers on game management and player safety when a challenge is “card-worthy” in intent/technique but doesn’t actually hit anyone.