E- First off, it would be impossible to disprove this without the chance to have observed the object beforehand. Also, I don't know if the impactor was observed over Finland. It could've been another object. The orientation of the "butterfly" blast pattern should determine if it is possible.

J- The only reason I am speculating about the event is due to the time frame that he saw the “vision”. The “vision” seems to match the time of the Tunguska event, and the explosion would have been east of the observers location.

E-That being said, do you suppose your grandfather would be able to resolve a human (large-1 meter tall) at the altitude of at least 100 kilometers?
Any lower in altitude and the dynamic pressure of the entry (at least 10 km/s) would make such an EVA impossible.

J- You are assuming that the object was a meteor or that IF it was a spacecraft, it used the trajectory and method of de-orbit that we are using today. What if it had been a spaceship that was able to fly like an airplane and the pilot was looking for a safe place to land?

E-Would your grandfather, educated before it was generally well known what this phenomea was be able to observe rationally with some understanding?

J- As I understand it, he was a well educated person with a good grasp of the technology of the period. However; he was unable to explain the observed phenomenon, therefore he explained as a “vision”. A “vision” from his perspective was real but incomprehensible event.

E-If I remember correctly, fragments of what is thought to be the object were removed from trees in the blast radius.

J- I wonder what would be left from a spaceship that explodes like an atomic bomb?
Cheers
Johannes