You can see a similar effect after the explosion at the end of last week's Starship test flight. If you look at where the flames are coming out after the first fireball clears, it kind of pancakes under its own weight there: https://www.youtube.com/live/Zi2SU98BAD8?t=5735s

Oh huh. You really can. I didn't pick up on that the first few hundred times I watched it. That's really cool. It kind of splats down into a 2-d rectangle.