Again a completely over simplistic simulation which does not take into account the atmospheric effects and the scale and the symmetry of the event.

If you take the event as being a missile launch from the white sea then the diameter of the event is 160-180 miles in diameter and the growing black disk consumes the diameter in a few to 10s of seconds meaning the diameter is expanding at 10-25 miles per sec or between 36,000 - 90,000 mph, which would mean the propellant exit velocity will be many many times this according to the simulation.

This is not a missile launch gone wrong being viewed at over 800+ km or 500+ miles away.

I have no explanation for what this is and I am absolutely stumped.