God expresses the same idea in two different ways in order to emphasize the terrifying appearance of Leviathan. You can make this clear by adding the omitted words. Alternate translation: "Out of his mouth go burning torches, sparks of fire leap out of his mouth" (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-ellipsis]])