What does wild horse mean? What is the explanation?

Sanskrit mar and ci. Translated as yang flame, flame (inflammation). The full name is Mustang Spring. This is a natural nymph illusion in the desert or wilderness. That is, when the gossamer of hot air or dust is far away, its phantom is like a real forest or spring, but when it approaches, it disappears again; So I know that wild horses are fake and have no entity. This is a non-self metaphor for various laws, such as the illusion that it can't last long. Great Wisdom Volume 6 (Big Two Five? 102): "Everything is like an illusion, bullying children, this is karma, uncomfortable, and will not live long. Therefore, all bodhisattvas know that all dharma circles are illusory and inflammatory; Inflammation is caused by dust in the sun, just like wild horses in the wilderness. No wise man calls it water when he first sees it. " [On Practice 12, On Great Wisdom13, The Great Sun Sutra] P 4818