A failure and a Smith, seemingly. But ***??? Cases are crushed.
Part of me wants to say "fake".
Thoughts?
My vote is "not fake" and "probable obstruction", and actually the crushed cases are the reason why.
My reasoning: If the barrel is obstructed, the blowback of the gases in the cylinder will attempt to escape out between the cylinder and forcing cone, leading to an overpressure inside the cylinder chamber, leading to the crushed cases as some of the gases try to exit around the case and out the back of the cylinder.
Also, it's difficult to tell from this one photo, but of the two cylinder chambers affected that are visible, the top one appears to still have the slug just in front of the empty crushed case. If so, this leads me to believe the shooter had a problem with the other chamber first but it didn't blow the cylinder apart, but instead of checking the weapon he just pulled the trigger again which is why the slug I think I can see didn't go far and the cylinder fragmented at that point.
The picture is just low-res enough, but it does appear that the barrel has a slight bulge in it which would be from an obstruction. If so then I believe there were actually three rounds involved in this order:
First round - weak load or bad round and bullet gets stuck in barrel.
Second round - normal round fired normally, fully packs barrel with the second bullet and gases escaping out the back of the cylinder crushes the case but the cylinder remains intact.
Third round - normal round fired normally, but the bullet does not enter the barrel (it already having two rounds in it) and the gases escaping out the back of the cylinder crushes the case and the increased overpressure from having the bullet remain in the chamber causes the cylinder to fragment.
Please note that in my scenario, the first round does not have to have been fired on the same day - it could possibly be the last round fired during an earlier session but the gun wasn't checked or cleaned before this incident occurred.
Just my two cents worth from one picture.