Looks to me, by the appearance of the crack...
Your slide didn't immediately widen, but started with a hairline. As shot were fired, that caused the crack to open wider, and finally, on the last shot, it was a wide enough gap to eliminate lockup between the barrel and slide.
So, your P-32 tried to be a blowback... and the case immediately began backing out of the chamber under high pressure, expanding as it went until it effectively locked itself into place.
As long as it's an empty case I see nothing wrong with using a wooden dowel or similiar instrument to insert through the barrel and gently tap out the case.
Be sure to remove the assembly pin and take off the slide first.
Flyer