Which scenario qualifies for a trauma alert involving a horse?

The scenario that qualifies for a trauma alert involving a horse is when the rider is ejected with an anatomical injury. This situation indicates a significant risk of serious injury given the dynamics of being thrown from a horse, which can result in complex trauma. Anatomical injuries can imply severe damage to bones, organs, or other structures of the body, necessitating swift medical intervention.

Being ejected implies not only the force of impact but also the potential for secondary injuries as the rider may fall awkwardly or land on hard surfaces. This aligns with trauma alert criteria that prioritize rapid assessment and treatment for those who have sustained serious injuries due to high-energy impacts or trauma.

In contrast, scenarios like being thrown off without injury, falling but remaining on the horse, or safely dismounting do not indicate the presence of significant injuries that would warrant a trauma alert. Each of these situations either suggests minimal impact or does not involve a high risk of serious harm, thus failing to meet the threshold for urgent medical evaluation and response.