This is a case of an experience while performing Taeeulju mantra dynamic meditation on January 10, 2016.
As told by Kwak, Min-Seo (11, Male) / Bucheon Sangdong Dojang

While performing dynamic meditation for a while, I had a vision of a golden-colored horse. On top of the horse sat a general spirit who wore golden-colored clothing with a large weapon. Because unpleasant creatures such as black insects covered the floor of the sacred shrine, I saw the general spirit was cutting them up with his long sword.