I really didn’t mean to be facetious. I think it must have sounded like John IMAGINED what a dragon would sound like. For example, if I said “Her voice was like that of a mermaid”, it would mean her voice would sound how I would imagine a mermaid to sound- kind of weird, plaintive, and siren like. I don’t think we are to be scientific with Revelation. I don’t know what a dragon sounds like, but I could imagine and if I heard a loud, animal yet oven like roar- like a living oven, I would say “That sounds like a dragon”.
My interpretation, of course.