King Charles’ royal guards use highly intelligent horses. Here one horse is gentle and welcoming to a disabled woman, while another horse will not tolerate someone (presumably a woman) in a burka. It would be nice if this were the same horse, but the different uniforms of the riders show it was two different horses.
Perhaps it takes a whole horse to tell the harmless from the potentially dangerous. We, however, being horses’ a**es, have difficulty distinguishing the difference.