This is useful evidence of the existence of dinosaurs in the time of Job. But verses 18-21 would necessitate an apologetic within an apologetic on behalf of dragon-like dinosaurs having existed at one time. Either these words are to be taken non-literally, which seems unlikely in the context, or there were at one time creatures that could do this i.e. breath fire. If these words regarding fire-breathing weren't there, it would be a better apologetic for the co-existence of dinosaurs and man, at least according to our current state of knowledge/perception of, dinosaurs and dragons.