Two horses facing each other is an image older than written history. Throughout northern Europe the Magical Nordic M Rune, Ehwaz, was as a stylized image of a horse facing its own reflection. This rune was a Symbol of Trust.
To these ancient people the horse was far more than a just a beast to alleviate the burdens of their lives; The horse was viewed as the Sacred Ambassador to Epona, the Celtic Goddess of Horses, and was believed to walk between the worlds of Men and Divinity.
The connection between the horse and rider is one of Mystic Communication, each "feeling" the other. This bond created between horse and rider is only possible with Mutual Trust and Awareness. This connection was called a "Divine Accord," and the Rune Ehwaz was used as a talisman to strengthen that Trust, Friendship, and Love.
It was not unheard of that a rider would allow the horse to wander freely with Absolute Trust and, guided by the will of Epona, it would bring the rider to their Ultimate Destiny.