I saw this posted on another site and although there was no story with it to say exactly what happened, I'm pretty sure it said a shredder caused the injuries
It looks more to me like the damage that would happen, if someone had their hand caught in one of the meat tenderizing machines that butchers and meat-cutters use in the meat markets.
I second that statement. Doesn't look to me like it could have been an egg slicer.