Barbaro was an American thoroughbred racehorse who was famously known for winning the 2006 Kentucky Derby. Unfortunately, he shattered his leg two weeks later in the 2006 Preakness Stakes. This ended his racing career and eventually lead to his death.
Lori Prince Peterson was a lifelong lover of horses. Interestingly, the blood for this piece was drawn from her own horse, Jack. Trevin remarked how the horse blood seemed much purer and richer than in comparison to working with human blood.