Technically, only the fact that the world started burning is significant. That a big fire continues to burn for 1 hour, that is not so surprising; unless the fire is violating the known laws of physics in some other ways.
The continuation of the burning makes the hallucination hypothesis less probable, for as long as it continues. Also, if it continues past the laws of physics, as you point out.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.