The role of Brother Huo doesn't exist in real history, but is invented by Chen Mou, the author of Fire Phoenix. In the novel, Brother Huo is Zhao Yun's code name, and Fire is his name. Brother Huo can be Zhao Zilong, which we are familiar with, or he can start a prairie fire with blood. Zhao Tong, the son of Zhao Yun, has also come to recognize Brother Huo. Brother Huo, though not the familiar Zhao Yun, has become the code name of Zhao Yun.