Here the phrase "of fire" means that these were surround by fire. AT: "a chariot surrounded by fire pulled by horses surrounded by fire" (See: [[rc://en/ta/man/translate/figs-possession]])
People would often tear their clothes as a sign of great sadness or grief. AT: "ripped them in two pieces to show his great sadness" (See: [[rc://en/ta/man/translate/translate-symaction]])